Ensure HMAC_size() handles errors correctly

Reviewed-by: N Rich Salz <rsalz@openssl.org>

Ensure HMAC_size() handles errors correctly
Reviewed-by: N Rich Salz <rsalz@openssl.org>
708e06c5 · Matt Caswell · 56a26ce3 · 708e06c5
隐藏空白更改
内联并排

Showing with 4 addition and 1 deletion

crypto/hmac/hmac.c crypto/hmac/hmac.c +4 -1

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--- a/crypto/hmac/hmac.c
+++ b/crypto/hmac/hmac.c
@@ -118,7 +118,10 @@ int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)

 size_t HMAC_size(const HMAC_CTX *ctx)
 {
-    return EVP_MD_size((ctx)->md);
+    int size = EVP_MD_size((ctx)->md);
+    if (size < 0)
+        return 0;
+    return size;
 }

 HMAC_CTX *HMAC_CTX_new(void)