linux-kernel - [PATCH 4.16 087/279] CIFS: set *resp_buf_type to NO

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Date:   Mon, 18 Jun 2018 10:11:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ronnie Sahlberg <lsahlber@...hat.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Steve French <smfrench@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.16 087/279] CIFS: set *resp_buf_type to NO_BUFFER on error

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

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

From: Steve French <smfrench@...il.com>

[ Upstream commit 117e3b7fed552eba96ae0b3b92312fe8c5b0bfdd ]

Dan Carpenter had pointed this out a while ago, but the code around
this had changed so wasn't causing any problems since that field
was not used in this error path.

Still, it is cleaner to always initialize this field, so changing
the error path to set it.

Reviewed-by: Ronnie Sahlberg <lsahlber@...hat.com>
CC: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Steve French <smfrench@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/cifs/transport.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -833,8 +833,11 @@ SendReceive2(const unsigned int xid, str
 	if (n_vec + 1 > CIFS_MAX_IOV_SIZE) {
 		new_iov = kmalloc(sizeof(struct kvec) * (n_vec + 1),
 				  GFP_KERNEL);
-		if (!new_iov)
+		if (!new_iov) {
+			/* otherwise cifs_send_recv below sets resp_buf_type */
+			*resp_buf_type = CIFS_NO_BUFFER;
 			return -ENOMEM;
+		}
 	} else
 		new_iov = s_iov;