netdev - [PATCH] virtio_net: fix the potential NULL pointer in xmit

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Date:	Fri, 14 Feb 2014 12:00:08 +0800
From:	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
To:	netdev@...r.kernel.org
Cc:	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: [PATCH] virtio_net: fix the potential NULL pointer in xmit_skb()

The pointer hdr isn't assigned before hdr->mhdr and hdr->hdr
are used, so it could be one invalid pointer.

Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
---
 drivers/net/virtio_net.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index d75f8ed..bf6397f 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -807,9 +807,9 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
 
 	pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
 	if (vi->mergeable_rx_bufs)
-		hdr_len = sizeof hdr->mhdr;
+		hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	else
-		hdr_len = sizeof hdr->hdr;
+		hdr_len = sizeof(struct virtio_net_hdr);
 
 	can_push = vi->any_header_sg &&
 		!((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
-- 
1.8.4.2

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