From 77827f3d63d0b12d840ed27b362f877e049dbbf5 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Fri, 23 Mar 2018 08:14:44 +0800
Subject: [PATCH] crypto: lrw - Free rctx->ext with kzfree

commit 8c9bdab21289c211ca1ca6a5f9b7537b4a600a02 upstream.

The buffer rctx->ext contains potentially sensitive data and should
be freed with kzfree.

Cc: <stable@vger.kernel.org>
Fixes: 700cb3f5fe75 ("crypto: lrw - Convert to skcipher")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 crypto/lrw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/lrw.c b/crypto/lrw.c
index eb681e9fe574..fdba6dd6db63 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -313,7 +313,7 @@ static void exit_crypt(struct skcipher_request *req)
 	rctx->left = 0;
 
 	if (rctx->ext)
-		kfree(rctx->ext);
+		kzfree(rctx->ext);
 }
 
 static int do_encrypt(struct skcipher_request *req, int err)