neighbour: fix a race in neigh_destroy()

[ 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@oracle.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 34032f27c513f3bc81c320f00373b976c0520f1c..f268c3444e1c89ba73594f191137c91fd84cec26 100644 (file)
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -237,7 +237,7 @@ static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev)
                                   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(struct neigh_table *tbl)
        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 *neigh)
                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 neighbour *neigh)
                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, const u8 *lladdr, u8 new,
 
                        write_lock_bh(&neigh->lock);
                }
-               skb_queue_purge(&neigh->arp_queue);
+               __skb_queue_purge(&neigh->arp_queue);
        }
 out:
        if (update_isrouter) {