X-Git-Url: https://git.openssl.org/?a=blobdiff_plain;f=crypto%2Fhmac%2Fhmac.c;fp=crypto%2Fhmac%2Fhmac.c;h=6c1a70e4bdad16c65b694828327ba087f9ae6c32;hb=206da660a37e84b7266db4e2c4e9485cdafb1366;hp=b49baec4c1e3806c7670cd8a22a3a6b9e48af83b;hpb=209c3d3ef655a807cdb109f3316bb86433ae7f07;p=openssl.git

diff --git a/crypto/hmac/hmac.c b/crypto/hmac/hmac.c
index b49baec4c1..6c1a70e4bd 100644
--- 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)