This is a note to let you know that I've just added the patch titled
net: fec: fix potential use after free
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-fec-fix-potential-use-after-free.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Jan 13 09:44:41 PST 2014
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Thu, 19 Dec 2013 10:53:02 -0800
Subject: net: fec: fix potential use after free
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit 7a2a84518cfb263d2c4171b3d63671f88316adb2 ]
skb_tx_timestamp(skb) should be called _before_ TX completion
has a chance to trigger, otherwise it is too late and we access
freed memory.
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Fixes: de5fb0a05348 ("net: fec: put tx to napi poll function to fix dead lock")
Cc: Frank Li <Frank.Li@xxxxxxxxxxxxx>
Cc: Richard Cochran <richardcochran@xxxxxxxxx>
Acked-by: Richard Cochran <richardcochran@xxxxxxxxx>
Acked-by: Frank Li <Frank.Li@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/freescale/fec_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -425,6 +425,8 @@ fec_enet_start_xmit(struct sk_buff *skb,
/* If this was the last BD in the ring, start at the beginning again. */
bdp = fec_enet_get_nextdesc(bdp, fep);
+ skb_tx_timestamp(skb);
+
fep->cur_tx = bdp;
if (fep->cur_tx == fep->dirty_tx)
@@ -433,8 +435,6 @@ fec_enet_start_xmit(struct sk_buff *skb,
/* Trigger transmission start */
writel(0, fep->hwp + FEC_X_DES_ACTIVE);
- skb_tx_timestamp(skb);
-
return NETDEV_TX_OK;
}
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-3.12/net-do-not-pretend-fraglist-support.patch
queue-3.12/arc_emac-fix-potential-use-after-free.patch
queue-3.12/virtio_net-fix-error-handling-for-mergeable-buffers.patch
queue-3.12/vxlan-release-rt-when-found-circular-route.patch
queue-3.12/br-fix-use-of-rx_handler_data-in-code-executed-on-non-rx_handler-path.patch
queue-3.12/net-fec-fix-potential-use-after-free.patch
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