This is a note to let you know that I've just added the patch titled
net: mvneta: fix race condition in mvneta_tx()
to the 3.18-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-mvneta-fix-race-condition-in-mvneta_tx.patch
and it can be found in the queue-3.18 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 Sun Dec 14 08:37:47 PST 2014
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Tue, 2 Dec 2014 04:30:59 -0800
Subject: net: mvneta: fix race condition in mvneta_tx()
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit 5f478b41033606d325e420df693162e2524c2b94 ]
mvneta_tx() dereferences skb to get skb->len too late,
as hardware might have completed the transmit and TX completion
could have freed the skb from another cpu.
Fixes: 71f6d1b31fb1 ("net: mvneta: replace Tx timer with a real interrupt")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/marvell/mvneta.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1721,6 +1721,7 @@ static int mvneta_tx(struct sk_buff *skb
u16 txq_id = skb_get_queue_mapping(skb);
struct mvneta_tx_queue *txq = &pp->txqs[txq_id];
struct mvneta_tx_desc *tx_desc;
+ int len = skb->len;
int frags = 0;
u32 tx_cmd;
@@ -1788,7 +1789,7 @@ out:
u64_stats_update_begin(&stats->syncp);
stats->tx_packets++;
- stats->tx_bytes += skb->len;
+ stats->tx_bytes += len;
u64_stats_update_end(&stats->syncp);
} else {
dev->stats.tx_dropped++;
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-3.18/net-fix-suspicious-rcu_dereference_check-in-net-sched-sch_fq_codel.c.patch
queue-3.18/net-mvneta-fix-race-condition-in-mvneta_tx.patch
queue-3.18/tcp-fix-more-null-deref-after-prequeue-changes.patch
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