3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
[ Upstream commit c9ab4d85de222f3390c67aedc9c18a50e767531e ]
There is a race in neighbour code, because neigh_destroy() uses
skb_queue_purge(&neigh->arp_queue) without holding neighbour lock,
while other parts of the code assume neighbour rwlock is what
protects arp_queue
Convert all skb_queue_purge() calls to the __skb_queue_purge() variant
Use __skb_queue_head_init() instead of skb_queue_head_init()
to make clear we do not use arp_queue.lock
And hold neigh->lock in neigh_destroy() to close the race.
Reported-by: Joe Jin <joe.jin@xxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/core/neighbour.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -237,7 +237,7 @@ static void neigh_flush_dev(struct neigh
we must kill timers etc. and move
it to safe state.
*/
- skb_queue_purge(&n->arp_queue);
+ __skb_queue_purge(&n->arp_queue);
n->output = neigh_blackhole;
if (n->nud_state & NUD_VALID)
n->nud_state = NUD_NOARP;
@@ -291,7 +291,7 @@ static struct neighbour *neigh_alloc(str
if (!n)
goto out_entries;
- skb_queue_head_init(&n->arp_queue);
+ __skb_queue_head_init(&n->arp_queue);
rwlock_init(&n->lock);
seqlock_init(&n->ha_lock);
n->updated = n->used = now;
@@ -712,7 +712,9 @@ void neigh_destroy(struct neighbour *nei
hh_cache_put(hh);
}
- skb_queue_purge(&neigh->arp_queue);
+ write_lock_bh(&neigh->lock);
+ __skb_queue_purge(&neigh->arp_queue);
+ write_unlock_bh(&neigh->lock);
dev_put(neigh->dev);
neigh_parms_put(neigh->parms);
@@ -864,7 +866,7 @@ static void neigh_invalidate(struct neig
neigh->ops->error_report(neigh, skb);
write_lock(&neigh->lock);
}
- skb_queue_purge(&neigh->arp_queue);
+ __skb_queue_purge(&neigh->arp_queue);
}
/* Called when a timer expires for a neighbour entry. */
@@ -1188,7 +1190,7 @@ int neigh_update(struct neighbour *neigh
write_lock_bh(&neigh->lock);
}
- skb_queue_purge(&neigh->arp_queue);
+ __skb_queue_purge(&neigh->arp_queue);
}
out:
if (update_isrouter) {
--
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