Add bounds checking to length returned by wcslen in wide_to_asc conversion to resolve...

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15316)

diff --git a/engines/e_capi.c b/engines/e_capi.c
index dd66518d3f5614c690e7ba885a0d0b8bce9b5443..2ea3cd20595a9c8a5e4c5c97d45321f1a46de15d 100644 (file)
--- a/engines/e_capi.c
+++ b/engines/e_capi.c
@@ -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);