| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.12 26/77] net: fec: fix potential use after free | Date | Mon, 13 Jan 2014 16:27:47 -0800 |
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3.12-stable review patch. If anyone has any objections, please let me know.
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From: Eric Dumazet <edumazet@google.com>
[ 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@google.com> Fixes: de5fb0a05348 ("net: fec: put tx to napi poll function to fix dead lock") Cc: Frank Li <Frank.Li@freescale.com> Cc: Richard Cochran <richardcochran@gmail.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Acked-by: Frank Li <Frank.Li@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- 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; }
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