From: Stephan Mueller <smueller@chronox.de>
Date: Tue, 11 Nov 2014 04:37:07 +0000 (+0100)
Subject: crypto: algif - zeroize message digest buffer
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=2a6af25befd0197e805b3aa5ebfc253079ce7136;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

crypto: algif - zeroize message digest buffer

Zeroize the buffer holding the message digest calculated for the
consumer before the buffer is released by the hash AF_ALG interface
handler.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 850246206b12..f75db4ce48bf 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -258,6 +258,8 @@ static void hash_sock_destruct(struct sock *sk)
 	struct alg_sock *ask = alg_sk(sk);
 	struct hash_ctx *ctx = ask->private;
 
+	memzero_explicit(ctx->result,
+		     crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
 	sock_kfree_s(sk, ctx->result,
 		     crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
 	sock_kfree_s(sk, ctx, ctx->len);