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 8502462..f75db4c 100644 (file)
--- 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);