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| author | Eric Dumazet <edumazet@google.com> | 2017-03-23 12:39:21 -0700 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2017-06-20 14:04:51 +0200 |
| commit | 4d1b81c2669bc6ab4ff24d649c876469aba412a9 (patch) | |
| tree | 7fd92fef3ef4fc8e7d08f042308fdfa0fac8182d /net | |
| parent | c1b42042a542f2493c7a1f0658c8cace120d7cff (diff) | |
| download | linux-4d1b81c2669bc6ab4ff24d649c876469aba412a9.tar.gz linux-4d1b81c2669bc6ab4ff24d649c876469aba412a9.tar.bz2 linux-4d1b81c2669bc6ab4ff24d649c876469aba412a9.zip | |
net: neigh: guard against NULL solicit() method
commit 48481c8fa16410ffa45939b13b6c53c2ca609e5f upstream.
Dmitry posted a nice reproducer of a bug triggering in neigh_probe()
when dereferencing a NULL neigh->ops->solicit method.
This can happen for arp_direct_ops/ndisc_direct_ops and similar,
which can be used for NUD_NOARP neighbours (created when dev->header_ops
is NULL). Admin can then force changing nud_state to some other state
that would fire neigh timer.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/neighbour.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c index b49e8bafab17..fb82e8a5b006 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -872,7 +872,8 @@ static void neigh_probe(struct neighbour *neigh) if (skb) skb = skb_copy(skb, GFP_ATOMIC); write_unlock(&neigh->lock); - neigh->ops->solicit(neigh, skb); + if (neigh->ops->solicit) + neigh->ops->solicit(neigh, skb); atomic_inc(&neigh->probes); kfree_skb(skb); } |