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lib: fix heap buffer overflow in dlt_with_filename_and_line_number #865

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lib: fix heap buffer overflow in dlt_with_filename_and_line_number #865

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10 changes: 8 additions & 2 deletions src/lib/dlt_user.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4673,7 +4673,12 @@ DltReturnValue dlt_with_filename_and_line_number(const char *fina, const int lin

/* Set filename and line number */
dlt_user.with_filename_and_line_number = 1;
dlt_user.filenamelen = (uint8_t)strlen(fina);

/* filenamelen is uint8_t (matching the V2 wire-format field width).
* Clamp to UINT8_MAX so the cast cannot overflow and the heap
* allocation cannot be undersized when strlen(fina) > 255. */
dlt_user.filenamelen = (strlen(fina) > UINT8_MAX) ? (uint8_t)UINT8_MAX : (uint8_t)strlen(fina);

if (dlt_user.filename != NULL) {
free(dlt_user.filename);
dlt_user.filename = NULL;
Expand All @@ -4684,7 +4689,8 @@ DltReturnValue dlt_with_filename_and_line_number(const char *fina, const int lin
dlt_vlog(LOG_ERR, "%s Could not allocate memory for filename", __func__);
return DLT_RETURN_ERROR;
}
strcpy(dlt_user.filename, fina);
strncpy(dlt_user.filename, fina, (size_t)dlt_user.filenamelen);
dlt_user.filename[(size_t)dlt_user.filenamelen] = '\0';

dlt_user.linenumber = (uint32_t)linr;
return DLT_RETURN_OK;
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