coverity 1462580 Improper use of negative value

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/11651)

diff --git a/crypto/hmac/hmac.c b/crypto/hmac/hmac.c
index b49baec4c1e3806c7670cd8a22a3a6b9e48af83b..6c1a70e4bdad16c65b694828327ba087f9ae6c32 100644 (file)
--- a/crypto/hmac/hmac.c
+++ b/crypto/hmac/hmac.c
@@ -55,6 +55,8 @@ int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
         j = EVP_MD_block_size(md);
         if (!ossl_assert(j <= (int)sizeof(keytmp)))
             return 0;
+        if (j < 0)
+            return 0;
         if (j < len) {
             if (!EVP_DigestInit_ex(ctx->md_ctx, md, impl)
                     || !EVP_DigestUpdate(ctx->md_ctx, key, len)