Examples of Prompt Strategies

extern igraph_error_t igraph_automorphism_group(const igraph_t * graph,const igraph_vector_int_t * colors,igraph_vector_int_list_t * generators,igraph_bliss_sh_t sh,igraph_bliss_info_t * info);

// the following function fuzzes igraph_automorphism_group

extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

UGCTX-K

Template

// The following is a fuzz driver written in C language, complete the implementation. Output the continued code in reply only.

#include "[[HEADER_FILE]]"

// @ examples of API usage [[EXAMPLE_FILE_NAME]]

[[EXAMPLE_CODE]]

[[API_DECLARATION]]

// the following function fuzzes [[API_NAME]]

int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

Example

// The following is a fuzz driver written in C language, complete the implementation. Output the continued code in reply only.

#include "isc/lex.h"

// @ examples of API usage from sources/bind9/lib/dns/rdata/generic/ptr_12.c-fromtext_ptr

// static inline isc_result_t

// fromtext_ptr(ARGS_FROMTEXT) {

// isc_token_t token;

// dns_name_t name;

// isc_buffer_t buffer;

//

// REQUIRE(type == 12);

//

// UNUSED(type);

// UNUSED(rdclass);

// UNUSED(callbacks);

//

// RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,

// ISC_FALSE));

//

// dns_name_init(&name, NULL);

// buffer_fromregion(&buffer, &token.value.as_region);

// origin = (origin != NULL) ? origin : dns_rootname;

// RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));

// if (rdclass == dns_rdataclass_in &&

// (options & DNS_RDATA_CHECKNAMES) != 0 &&

// (options & DNS_RDATA_CHECKREVERSE) != 0) {

// isc_boolean_t ok;

// ok = dns_name_ishostname(&name, ISC_FALSE);

// if (!ok && (options & DNS_RDATA_CHECKNAMESFAIL) != 0)

// RETTOK(DNS_R_BADNAME);

// if (!ok && callbacks != NULL)

// warn_badname(&name, lexer, callbacks);

// }

// return (ISC_R_SUCCESS);

// }

extern void dns_name_init(dns_name_t * name,unsigned char * offsets);

extern _Bool dns_name_ishostname(const dns_name_t * name,_Bool wildcard);

extern isc_result_t isc_lex_getmastertoken(isc_lex_t * lex,isc_token_t * token,isc_tokentype_t expect,_Bool eol);

extern isc_result_t dns_name_fromtext(dns_name_t * name,isc_buffer_t * source,const dns_name_t * origin,unsigned int options,isc_buffer_t * target);

// the following function fuzzes isc_lex_getmastertoken based on the above API usages

extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

BA-ITER-K & ALL-ITER-K

As discussed in the paper, the prompts of each iterative strategy contain query prompts and fix prompts.

For the query prompts, its template is one of the above mentioned prompts. Specifically, for BA-ITER-K, it is BACTX only while for ALL-ITER-K, it is one of the BACTX, DOCTX, and UGCTX.

There are in total seven types of fix prompts, their templates and examples are listed in the following contents.

FIX_PRSE_ERR

Template

```

[[INEFFECTIVE_FUZZ_DRIVER_CODE]]

```

The above C code has compilation error.

The error line is:
[[ERR_LINE_CODE]]

The error description is: [[ERR_DESCRIPTION]]

[[SUPPLEMENTAL_INFO]]

Based on the above information, fix the code.

Example

```

#include "libdwarf/libdwarf.h"

// the following function fuzzes dwarf_init_b

extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

int dw_fd; // declare dw_fd without initializing it

unsigned int dw_groupnumber = 0; // initialize dw_groupnumber with 0

Dwarf_Handler dw_errhand = NULL; // initialize dw_errhand with NULL

Dwarf_Ptr dw_errarg = NULL; // initialize dw_errarg with NULL

Dwarf_Debug dw_dbg = NULL; // initialize dw_dbg with NULL

Dwarf_Error dw_error = NULL; // initialize dw_error with NULL

// Create a new file descriptor and open it for writing

char *filename = "/tmp/dwarf_input_file";

dw_fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);

if (dw_fd < 0) {

perror("open");

return 0;

}

// Write the input data to the file descriptor

write(dw_fd, Data, Size);

close(dw_fd);

// Call dwarf_init_b with the parameters set up above

dw_fd = open(filename, O_RDONLY); // open the input file for reading

int result = dwarf_init_b(dw_fd, dw_groupnumber, dw_errhand, dw_errarg, &dw_dbg, &dw_error);

close(dw_fd); // close the input file descriptor

if (result != DW_DLV_OK) {

fprintf(stderr, "dwarf_init_b failed: %s\n", dwarf_errmsg(dw_error));

if (dw_error != NULL) {

dwarf_dealloc_error(dw_error); // free the memory allocated for Dwarf_Error

}

} else {

dwarf_finish(dw_dbg); // free the memory allocated for Dwarf_Debug

}

return 0;

}

```

The above C code has compilation error.

The error line is:

dwarf_dealloc_error(dw_error); // free the memory allocated for Dwarf_Error

The error description is:

too few arguments to function call, expected 2, have 1

The definition of `dwarf_dealloc_error`:

/*! @brief Free (dealloc) an Dwarf_Error something created.

@param dw_dbg

The relevant Dwarf_Debug pointer.

@param dw_error

A pointer to a Dwarf_Error. The pointer is then stale

so you should immediately zero that pointer passed

in.

*/

extern void dwarf_dealloc_error(Dwarf_Debug dw_dbg,Dwarf_Error dw_error);

// @ examples of API `dwarf_dealloc_error` usage from /tmp/sourcegraph_tmpdir/github.com/davea42/libdwarf-code/src/lib/libdwarf/dwarf_object_detector.c

// static int

// _dwarf_debuglink_finder_newpath(

// char * path_in,

// unsigned char *crc_in,

// unsigned buildid_len_in,

// unsigned char *buildid_in,

// dwarfstring *m,

// int * fd_out,

// int * errcode)

// {

// unsigned char lcrc[4];

// char *debuglinkpath = 0; /* must be freed */

// unsigned char *crc = 0;

// char *debuglinkfullpath = 0;

// unsigned debuglinkfullpath_strlen = 0;

// unsigned buildid_type = 0;

// char * buildidownername = 0;

// unsigned char *buildid = 0;

// unsigned buildid_length = 0;

// char ** paths = 0; /* must be freed */

// unsigned paths_count = 0;

// Dwarf_Debug dbg = 0;

// Dwarf_Error error = 0;

// char *path = path_in;

// int res = 0;

//

// res = dwarf_init_path(path,

// 0,0,

// DW_DLC_READ, DW_GROUPNUMBER_ANY,

// 0,0, &dbg,

// 0,0,0,&error);

// if (res == DW_DLV_ERROR) {

// dwarf_dealloc_error(dbg,error);

// error = 0;

// return DW_DLV_NO_ENTRY;

// }

// if (res == DW_DLV_NO_ENTRY) {

// /* should never happen */

// return DW_DLV_NO_ENTRY;

// }

// res = dwarf_gnu_debuglink(dbg,

// &debuglinkpath,

// &crc, &debuglinkfullpath, &debuglinkfullpath_strlen,

// &buildid_type, &buildidownername,

// &buildid, &buildid_length,

// &paths, &paths_count, &error);

// if (res == DW_DLV_ERROR) {

// *errcode = dwarf_errno(error);

// dwarf_dealloc_error(dbg,error);

// dwarf_finish(dbg,&error);

// return DW_DLV_NO_ENTRY;

// } else if (res == DW_DLV_NO_ENTRY) {

// /* There is no debuglink section */

// dwarf_finish(dbg,&error);

// return DW_DLV_NO_ENTRY;

// }

//

// free(paths);

// paths = 0;

// memset(&lcrc[0],0,sizeof(lcrc));

// if (crc_in && !crc) {

// res = dwarf_crc32(dbg,lcrc,&error);

// if (res == DW_DLV_ERROR) {

// paths = 0;

// free(debuglinkfullpath);

// dwarf_dealloc_error(dbg,error);

// dwarf_finish(dbg,&error);

// /* Cannot match the crc_in, give up. */

// return DW_DLV_NO_ENTRY;

// } else if (res == DW_DLV_OK) {

// crc = &lcrc[0];

// }

// free(debuglinkfullpath);

// res = match_buildid(

// /* This is the executable */

// crc_in,buildid_len_in,buildid_in,

// /* pass in local so we can calculate the missing crc */

// /* following is the target, ie, debug */

// crc,buildid_length,buildid);

// if (res == DW_DLV_OK) {

// dwarfstring_append(m,path);

// *fd_out = dbg->de_fd;

// dbg->de_owns_fd = FALSE;

// dwarf_finish(dbg,&error);

// return DW_DLV_OK;

// }

// dwarf_finish(dbg,&error);

// return DW_DLV_NO_ENTRY;

// }

Based on the above information, fix the code.

FIX_LINK_ERR

Template

```

[[INEFFECTIVE_FUZZ_DRIVER_CODE]]

```

The above C code calls a non-existing API [[API_NAME]]. [[SUPPLEMENTAL_INFO]]

Based on the above information, fix the code.

Example

```

#include "md4c-html.h"

#include <stdlib.h>

#include <string.h>

typedef struct membuffer {

MD_CHAR *data;

MD_SIZE size;

MD_SIZE asize;

} membuffer;

static void membuf_init(membuffer *buf, MD_SIZE initial_size) {

buf->data = (MD_CHAR *) malloc(initial_size);

buf->size = 0;

buf->asize = initial_size;

}

static void membuf_grow(membuffer *buf, MD_SIZE new_size) {

buf->data = (MD_CHAR *) realloc(buf->data, new_size);

buf->asize = new_size;

}

static void membuf_fini(membuffer *buf) {

free(buf->data);

buf->size = 0;

buf->asize = 0;

}

// Declaration of the process_output function

static void process_output(MD_TEXTTYPE type, const MD_CHAR *text, MD_SIZE size, void *userdata);

// The rest of the code remains unchanged...

extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

membuffer buf_out = {0};

int parser_flags = 0;

int renderer_flags = 0;

// Initialize the output buffer

membuf_init(&buf_out, (MD_SIZE)(Size + Size/8 + 64));

// Call md_html with the provided input data

md_html((const MD_CHAR *)Data, (MD_SIZE)Size, process_output, (void *)&buf_out, parser_flags, renderer_flags);

// Clean up the output buffer

membuf_fini(&buf_out);

return 0;

}

```

The above C code calls a non-existing API process_output.

The definition of `md_html`:

extern int md_html(const MD_CHAR * input,MD_SIZE input_size,void (*)(const MD_CHAR *, MD_SIZE, void *) process_output,void * userdata,unsigned int parser_flags,unsigned int renderer_flags);

// @ examples of API `md_html` usage from /tmp/sourcegraph_tmpdir/github.com/Stellarium/stellarium-web-engine/src/modules/skycultures.c

// char *skycultures_md_2_html(const char *md)

// {

// UT_string s, s2;

// char *ret = NULL;

// const char* str;

// char tmp[256];

// int n;

// regex_t re;

// regmatch_t m[2];

//

// utstring_init(&s);

// utstring_printf(&s, "%s", md);

//

// // Apply custom rules for references

// // Replace reference list with proper HTML refs, i.e.:

// // replace - [#1]: XXXX by linkable span

// regcomp(&re, "^ - \\[#([0-9]+)\\]: ", REG_EXTENDED | REG_NEWLINE);

// while (regexec(&re, utstring_body(&s), 2, m, 0) == 0) {

// str = utstring_body(&s);

// memset(tmp, 0, sizeof(tmp));

// memcpy(tmp, str + m[1].rm_so, m[1].rm_eo - m[1].rm_so);

// n = atoi(tmp);

// snprintf(tmp, sizeof(tmp), " - <span id=\"cite_%d\">[%d]</span> ",

// n, n);

// utstring_replace(&s, m[0].rm_so, m[0].rm_eo, tmp);

// }

// regfree(&re);

//

// utstring_init(&s2);

// md_html(utstring_body(&s), utstring_len(&s), process_output, &s2,

// MD_DIALECT_GITHUB, 0);

//

// // Replace reference links with proper HTML links

// regcomp(&re, " ?\\[#([0-9]+)\\]", REG_EXTENDED | REG_NEWLINE);

// while (regexec(&re, utstring_body(&s2), 2, m, 0) == 0) {

// str = utstring_body(&s2);

// memset(tmp, 0, sizeof(tmp));

// memcpy(tmp, str + m[1].rm_so, m[1].rm_eo - m[1].rm_so);

// n = atoi(tmp);

// snprintf(tmp, sizeof(tmp), "<sup>[%d]</sup>", n);

// utstring_replace(&s2, m[0].rm_so, m[0].rm_eo, tmp);

// }

// regfree(&re);

//

// ret = strdup(utstring_body(&s2));

// utstring_done(&s);

// utstring_done(&s2);

//

// return ret;

// }

Based on the above information, fix the code.

FIX_FUZZ_MEMLEAK

Template

```

[[INEFFECTIVE_FUZZ_DRIVER_CODE]]

```

The above C code can be built successfully but has runtime memory leak.

[[SUPPLEMENTAL_INFO]]

Based on the above information, fix the code.

Example

```

#include "igraph/igraph_foreign.h"

// ...

extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

// ...

// Generate a temporary filename

char tmp_filename[L_tmpnam];

tmpnam(tmp_filename);

// Write input data to a temporary file

FILE *write_stream = fopen(tmp_filename, "wb");

if (!write_stream) {

return 0; // Cannot open the temporary file for writing, skip this input

}

fwrite(Data, 1, Size, write_stream);

fclose(write_stream);

// Open the temporary file for reading

FILE *stream = fopen(tmp_filename, "r");

if (!stream) {

unlink(tmp_filename);

return 0; // Cannot open the temporary file, skip this input

}

// Initialize an empty igraph_t structure

igraph_t graph;

igraph_empty(&graph, 0, IGRAPH_UNDIRECTED);

// Call the fuzzed function

igraph_error_handler_t* old_handler = igraph_set_error_handler(igraph_error_handler_ignore); // Set error handler to ignore errors

igraph_error_t result = igraph_read_graph_pajek(&graph, stream);

igraph_set_error_handler(old_handler); // Restore previous error handler

if (result != IGRAPH_SUCCESS) {

// Handle the error, e.g., log it, and continue execution

}

// ...

// Close the file and remove the temporary file

fclose(stream);

unlink(tmp_filename);

return 0;

}

```

The above C code can be built successfully but has runtime memory leak.

The leak related lines of code are:

igraph_empty(&graph, 0, IGRAPH_UNDIRECTED);

Based on the above information, fix the code.

FIX_FUZZ_OOM

Template

```

[[INEFFECTIVE_FUZZ_DRIVER_CODE]]

```

The above C code can be built successfully but meet out-of-memory, perhaps due to memory leak.

[[SUPPLEMENTAL_INFO]]

Based on the above information, fix the code.

Example

```

#include "pjlib-util/json.h"

//extern pj_json_elem * pj_json_parse(pj_pool_t * pool,char * buffer,unsigned int * size,pj_json_err_info * err_info);

// the following function fuzzes pj_json_parse

extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

pj_pool_t *pool;

pj_json_elem *root;

pj_json_err_info err_info;

unsigned int buf_size;

// Initialize the caching pool

pj_caching_pool caching_pool;

pj_caching_pool_init(&caching_pool, NULL, 4096);

// Initialize the pool

pool = pj_pool_create(&caching_pool.factory, "json_fuzzer_pool", 4096, 4096, NULL);

if (!pool) {

return 0; // unable to create pool

}

// Allocate memory for the input buffer

char *buffer = (char *)pj_pool_alloc(pool, Size + 1);

if (!buffer) {

pj_pool_release(pool);

return 0; // unable to allocate memory

}

// Copy the input data to the buffer and null-terminate it

memcpy(buffer, Data, Size);

buffer[Size] = '\0';

// Parse the JSON input

buf_size = (unsigned int)Size;

root = pj_json_parse(pool, buffer, &buf_size, &err_info);

// Clean up and return

pj_pool_release(pool);

return 0; // non-zero return values are reserved for future use

}

```

The above C code can be built successfully but meet out-of-memory, perhaps due to memory leak.

The out-of-memory related stacks are:

pool = pj_pool_create(&caching_pool.factory, "json_fuzzer_pool", 4096, 4096, NULL);

Based on the above information, fix the code.

FIX_FUZZ_TIMEOUT

Template

```

[[INEFFECTIVE_FUZZ_DRIVER_CODE]]

```

The above C code can be built successfully but will stuck (timeout).

The possible stuck line is:

[[ERR_LINE_CODE]]

The frames of the stack are:

[[ERR_STACK]]

[[SUPPLEMENTAL_INFO]]

Based on the above information, fix the code.

Example

```

#include "wc.h"

//extern Str wc_Str_conv_with_detect(Str is,wc_ces * f_ces,wc_ces hint,wc_ces t_ces);

// the following function fuzzes wc_Str_conv_with_detect

extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

wc_ces f_ces, hint, t_ces;

Str input, output;

if (Size == 0)

return 0;

input = Strnew_size(Size);

for (size_t i = 0; i < Size; i++) {

input->ptr[i] = Data[i];

}

input->ptr[Size] = '\0';

// Assign random or specific CES values to f_ces, hint, and t_ces

// Here, we are using specific values for demonstration purposes.

f_ces = WC_CES_US_ASCII;

hint = WC_CES_ISO_8859_1;

t_ces = WC_CES_UTF_8;

output = wc_Str_conv_with_detect(input, &f_ces, hint, t_ces);

Strfree(input);

Strfree(output);

return 0;

}

```

The above C code can be built successfully but will stuck (timeout).

The frames of the stack are:

#0 0x5391e1 in __sanitizer_print_stack_trace /src/llvm-project/compiler-rt/lib/asan/asan_stack.cpp:87:3

#1 0x457cf8 in fuzzer::PrintStackTrace() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerUtil.cpp:210:5

#2 0x43c949 in fuzzer::Fuzzer::AlarmCallback() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:301:5

#3 0x7ffff7dd241f (/lib/x86_64-linux-gnu/libpthread.so.0+0x1441f) (BuildId: 7b4536f41cdaa5888408e82d0836e33dcf436466)

#4 0x5b348f in GC_clear_fl_marks.part.0 alloc.o

#5 0x5b3c68 in GC_finish_collection (/root/workspace/jarvis/targets/w3m/c/para-0/dummyfuzzer+0x5b3c68)

Based on the above information, fix the code.

FIX_FUZZ_CRASH

Template

```

[[INEFFECTIVE_FUZZ_DRIVER_CODE]]

```

The above C code can be built successfully but will crash ([[CRASH_SYMPTOM]]).

The crash line is:

[[ERR_LINE_CODE]]

The frames of the stack are:

[[ERR_DESCRIPTION]]

[[SUPPLEMENTAL_INFO]]

Based on the above information, fix the code.

Example

```

#include "quickjs.h"

//extern JSValue JS_Eval(JSContext * ctx,const char * input,size_t input_len,const char * filename,int eval_flags);

// the following function fuzzes JS_Eval

extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

if (Size > 1024 * 1024) { // limit input size to 1 MB

return 0;

}

JSRuntime *rt = JS_NewRuntime();

JSContext *ctx = JS_NewContext(rt);

JSValue result;

const char *filename = "fuzz.js";

int eval_flags = JS_EVAL_TYPE_GLOBAL;

if (Data && Size > 0) {

result = JS_Eval(ctx, (const char *)Data, Size, filename, eval_flags);

JS_FreeValue(ctx, result);

}

JS_FreeContext(ctx);

JS_FreeRuntime(rt);

return 0;

}

```

The above C code can be built successfully but will crash (ASAN-heap-buffer-overflow on address 0x602000000111 at pc 0x0000007024e0 bp 0x7ffec5e4b850 sp 0x7ffec5e4b848).

The crash line is:

result = JS_Eval(ctx, (const char *)Data, Size, filename, eval_flags);

The frames of the stack are:

#0 0x7024df in next_token /src/quickjs/quickjs.c:20678:9

#1 0x61ba55 in js_parse_program /src/quickjs/quickjs.c:33463:9

#2 0x61ba55 in __JS_EvalInternal /src/quickjs/quickjs.c:33654:11

#3 0x5f7744 in JS_EvalInternal /src/quickjs/quickjs.c:33694:12

#4 0x5f7744 in JS_EvalThis /src/quickjs/quickjs.c:33725:11

#5 0x5f7744 in JS_Eval /src/quickjs/quickjs.c:33733:12

#6 0x56a041 in LLVMFuzzerTestOneInput /root/workspace/jarvis/targets/quickjs/c/para-iter-account-12-0/dummyfuzzer.c:122:18

The frame `next_token` related code:

20677 s->token.ptr = p;

20678 c = *p;

20679 switch(c) {

The frame `js_parse_program` related code:

33462

33463 if (next_token(s))

33464 return -1;

The frame `__JS_EvalInternal` related code:

33653

33654 err = js_parse_program(s);

33655 if (err) {

The frame `JS_EvalInternal` related code:

33693 }

33694 return ctx->eval_internal(ctx, this_obj, input, input_len, filename,

33695 flags, scope_idx);

The frame `JS_EvalThis` related code:

33724 eval_type == JS_EVAL_TYPE_MODULE);

33725 ret = JS_EvalInternal(ctx, this_obj, input, input_len, filename,

33726 eval_flags, -1);

The frame `JS_Eval` related code:

33732 {

33733 return JS_EvalThis(ctx, ctx->global_obj, input, input_len, filename,

33734 eval_flags);

The definition of `JS_Eval`:

extern JSValue JS_Eval(JSContext * ctx,const char * input,size_t input_len,const char * filename,int eval_flags);

// @ examples of API `JS_Eval` usage from /tmp/sourcegraph_tmpdir/github.com/lcexc/py-quickjs/src/libqjs.c

// int eval_buf(JSContext *ctx, const void *buf, int buf_len,

// const char *filename, int eval_flags)

// {

// JSValue val;

// int ret;

//

// if ((eval_flags & JS_EVAL_TYPE_MASK) == JS_EVAL_TYPE_MODULE) {

// /* for the modules, we compile then run to be able to set

// import.meta */

// val = JS_Eval(ctx, buf, buf_len, filename,

// eval_flags | JS_EVAL_FLAG_COMPILE_ONLY);

// if (!JS_IsException(val)) {

// js_module_set_import_meta(ctx, val, 1, 1);

// val = JS_EvalFunction(ctx, val);

// }

// } else {

// val = JS_Eval(ctx, buf, buf_len, filename, eval_flags);

// }

// if (JS_IsException(val)) {

// js_std_dump_error(ctx);

// ret = -1;

// } else {

// ret = 0;

// }

// JS_FreeValue(ctx, val);

// return ret;

// }

Based on the above information, fix the code.

FIX_FUZZ_NONEFF

Template

```

[[INEFFECTIVE_FUZZ_DRIVER_CODE]]

```

The above C code can be built successfully but its fuzzing seems not effective since the coverage never change.

Based on the above information, fix the code if necessary.

Example

```

#include "dns/message.h"

//extern isc_result_t dns_message_checksig(dns_message_t * msg,dns_view_t * view);

// the following function fuzzes dns_message_checksig

extern int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

if (Size < sizeof(dns_message_t) + sizeof(dns_view_t)) {

return 0;

}

// Prepare the dns_message_t structure

dns_message_t msg;

memcpy(&msg, Data, sizeof(dns_message_t));

Data += sizeof(dns_message_t);

Size -= sizeof(dns_message_t);

// Prepare the dns_view_t structure

dns_view_t view;

memcpy(&view, Data, sizeof(dns_view_t));

Data += sizeof(dns_view_t);

Size -= sizeof(dns_view_t);

// Call the target function with the fuzzed inputs

isc_result_t res = dns_message_checksig(&msg, &view);

// Return 0 as the fuzzer is looking for crashes and memory issues, not return values

return 0;

}

```

The above C code can be built successfully but its fuzzing seems not effective since the coverage never change.

Based on the above information, fix the code if necessary.