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xen-netback: Fix releasing frag_list skbs in error path

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When the grant operations failed, the skb is freed up eventually, and it tries
to release the frags, if there is any. For the main skb nr_frags is set to 0 to
avoid this, but on the frag_list it iterates through the frags array, and tries
to call put_page on the page pointer which contains garbage at that time.

Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Reported-by: Armin Zentai <armin.zentai@ezit.hu>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xenproject.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zoltan Kiss 2014-07-18 19:08:03 +01:00 committed by David S. Miller
parent 1a998d3e6b
commit b42cc6e421
1 changed files with 9 additions and 0 deletions
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9
drivers/net/xen-netback/netback.c
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@ -1521,7 +1521,16 @@ static int xenvif_tx_submit(struct xenvif_queue *queue)
/* Check the remap error code. */
if (unlikely(xenvif_tx_check_gop(queue, skb, &gop_map, &gop_copy))) {
/* If there was an error, xenvif_tx_check_gop is
* expected to release all the frags which were mapped,
* so kfree_skb shouldn't do it again
*/
skb_shinfo(skb)->nr_frags = 0;
if (skb_has_frag_list(skb)) {
struct sk_buff *nskb =
skb_shinfo(skb)->frag_list;
skb_shinfo(nskb)->nr_frags = 0;
}
kfree_skb(skb);
continue;
}