Fix leak in HMAC error path

In the event of an error in the HMAC function, leaks can occur because the
HMAC_CTX does not get cleaned up.

Thanks to the BoringSSL project for reporting this issue.

Reviewed-by: Richard Levitte <levitte@openssl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/crypto/hmac/hmac.c b/crypto/hmac/hmac.c
index 572393e2c7..d50fabb7c1 100644
--- a/crypto/hmac/hmac.c
+++ b/crypto/hmac/hmac.c
@@ -219,6 +219,7 @@ unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
     HMAC_CTX_cleanup(&c);
     return md;
  err:
+    HMAC_CTX_cleanup(&c);
     return NULL;
 }