[PATCH 4.15 49/72] crypto: lrw - Free rctx->ext with kzfree

[Greg Kroah-Hartman]

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

commit 8c9bdab21289c211ca1ca6a5f9b7537b4a600a02 upstream.

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

Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 700cb3f5fe75 ("crypto: lrw - Convert to skcipher")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 crypto/lrw.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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