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Fix json offset #3538

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Fix json offset #3538

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2991190
Fix json offset
JonathanBerrew Apr 7, 2026
3a34f0c
Remove unused functions
JonathanBerrew Apr 16, 2026
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34 changes: 17 additions & 17 deletions apache2/msc_json.c
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Original file line number Diff line number Diff line change
Expand Up @@ -187,7 +187,8 @@ static int yajl_start_array(void *ctx) {
msr->json->current_depth++;
if (msr->json->current_depth > msr->txcfg->reqbody_json_depth_limit) {
msr->json->depth_limit_exceeded = 1;
return 0;
msr->json->yajl_error = apr_psprintf(msr->mp, "More than %d JSON nesting", msr->txcfg->reqbody_json_depth_limit);
return 0;
}

if (msr->txcfg->debuglog_level >= 9) {
Expand Down Expand Up @@ -375,23 +376,21 @@ int json_process_chunk(modsec_rec *msr, const char *buf, unsigned int size, char
assert(msr->json != NULL);
assert(error_msg != NULL);
*error_msg = NULL;
base_offset=buf;
// Take a copy in case libyajl decodes the buffer inline
base_offset = apr_pstrmemdup(msr->mp, buf, size);
if (!base_offset) return -1;

/* Feed our parser and catch any errors */
msr->json->status = yajl_parse(msr->json->handle, buf, size);
msr->json->status = yajl_parse(msr->json->handle, (unsigned char*)base_offset, size);
if (msr->json->status != yajl_status_ok) {
if (msr->json->depth_limit_exceeded) {
*error_msg = "JSON depth limit exceeded";
} else {
if (msr->json->yajl_error) *error_msg = msr->json->yajl_error;
else {
char* yajl_err = yajl_get_error(msr->json->handle, 0, buf, size);
*error_msg = apr_pstrdup(msr->mp, yajl_err);
yajl_free_error(msr->json->handle, yajl_err);
char* yajl_err = yajl_get_error(msr->json->handle, 0, base_offset, size);
*error_msg = apr_pstrdup(msr->mp, yajl_err);
yajl_free_error(msr->json->handle, yajl_err);
}
}
return -1;
}
}

return 1;
}
Expand All @@ -404,18 +403,19 @@ int json_complete(modsec_rec *msr, char **error_msg) {
assert(msr->json != NULL);
assert(error_msg != NULL);

if (error_msg == NULL) return -1;
*error_msg = NULL;

/* Wrap up the parsing process */
msr->json->status = yajl_complete_parse(msr->json->handle);
if (msr->json->status != yajl_status_ok) {
if (msr->json->depth_limit_exceeded) {
*error_msg = "JSON depth limit exceeded";
if (msr->json->depth_limit_exceeded) {
*error_msg = "JSON depth limit exceeded";
} else {
char *yajl_err = yajl_get_error(msr->json->handle, 0, NULL, 0);
*error_msg = apr_pstrdup(msr->mp, yajl_err);
yajl_free_error(msr->json->handle, yajl_err);
}
char* yajl_err = yajl_get_error(msr->json->handle, 0, NULL, 0);
*error_msg = apr_pstrdup(msr->mp, yajl_err);
yajl_free_error(msr->json->handle, yajl_err);
}

return -1;
}
Expand Down