Avoid overflow in MDC2_Update()

Thanks to Shi Lei for reporting this issue. CVE-2016-6303 Reviewed-by: Matt Caswell <matt@openssl.org> (cherry picked from commit 55d83bf)
openssl · Aug 24, 2016 · 1027ad4 · 1027ad4
1 parent 0fff506
commit 1027ad4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/crypto/mdc2/mdc2dgst.c b/crypto/mdc2/mdc2dgst.c
@@ -91,7 +91,7 @@ int MDC2_Update(MDC2_CTX *c, const unsigned char *in, size_t len)
 
     i = c->num;
     if (i != 0) {
-        if (i + len < MDC2_BLOCK) {
+        if (len < MDC2_BLOCK - i) {
             /* partial block */
             memcpy(&(c->data[i]), in, len);
             c->num += (int)len;