Add bounds checking to length returned by wcslen in wide_to_asc conversion to resolve integer overflow flaw
@@ -1120,10 +1120,19 @@ static char *wide_to_asc(LPCWSTR wstr)
{
char *str;
int len_0, sz;
+ size_t len_1;
if (!wstr)
return NULL;
- len_0 = (int)wcslen(wstr) + 1; /* WideCharToMultiByte expects int */
+
+ len_1 = wcslen(wstr) + 1;
+
+ if (len_1 > INT_MAX) {
+ CAPIerr(CAPI_F_WIDE_TO_ASC, CAPI_R_FUNCTION_NOT_SUPPORTED);
+ return NULL;
+ }
+
+ len_0 = (int)len_1; /* WideCharToMultiByte expects int */
sz = WideCharToMultiByte(CP_ACP, 0, wstr, len_0, NULL, 0, NULL, NULL);
if (!sz) {
CAPIerr(CAPI_F_WIDE_TO_ASC, CAPI_R_WIN32_ERROR);
