linux-kernel - [PATCH AUTOSEL 5.1 26/59] crypto: hmac - fix memory leak in hmac_init

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Date:   Fri, 14 Jun 2019 16:28:10 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Eric Biggers <ebiggers@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <sashal@...nel.org>, linux-crypto@...r.kernel.org
Subject: [PATCH AUTOSEL 5.1 26/59] crypto: hmac - fix memory leak in hmac_init_tfm()

From: Eric Biggers <ebiggers@...gle.com>

[ Upstream commit 7829a0c1cb9c80debfb4fdb49b4d90019f2ea1ac ]

When I added the sanity check of 'descsize', I missed that the child
hash tfm needs to be freed if the sanity check fails.  Of course this
should never happen, hence the use of WARN_ON(), but it should be fixed.

Fixes: e1354400b25d ("crypto: hash - fix incorrect HASH_MAX_DESCSIZE")
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 crypto/hmac.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crypto/hmac.c b/crypto/hmac.c
index 4b8c8ee8f15c..c623778b36ba 100644
--- a/crypto/hmac.c
+++ b/crypto/hmac.c
@@ -168,8 +168,10 @@ static int hmac_init_tfm(struct crypto_tfm *tfm)
 
 	parent->descsize = sizeof(struct shash_desc) +
 			   crypto_shash_descsize(hash);
-	if (WARN_ON(parent->descsize > HASH_MAX_DESCSIZE))
+	if (WARN_ON(parent->descsize > HASH_MAX_DESCSIZE)) {
+		crypto_free_shash(hash);
 		return -EINVAL;
+	}
 
 	ctx->hash = hash;
 	return 0;
-- 
2.20.1