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| author | Bernd Schubert <bernd.schubert@itwm.fraunhofer.de> | 2011-08-16 10:56:54 +0000 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2011-08-16 10:19:20 -0700 |
| commit | 22cfb0bf6721bb1f865f67bc21e3c36c272faf36 (patch) | |
| tree | d70baecd0e7aa0e63cafa82178a16a39587df7cb /drivers/infiniband | |
| parent | 322a8b034003c0d46d39af85bf24fee27b902f48 (diff) | |
| download | linux-22cfb0bf6721bb1f865f67bc21e3c36c272faf36.tar.gz linux-22cfb0bf6721bb1f865f67bc21e3c36c272faf36.tar.bz2 linux-22cfb0bf6721bb1f865f67bc21e3c36c272faf36.zip | |
IPoIB: Fix possible NULL dereference in ipoib_start_xmit()
Fix a bug introduced in 69cce1d14049 ("net: Abstract dst->neighbour
accesses behind helpers.") where we might dereference skb_dst(skb)
even if it is NULL, which causes:
[ 240.944030] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
[ 240.948007] IP: [<ffffffffa0366ce9>] ipoib_start_xmit+0x39/0x280 [ib_ipoib]
[...]
[ 240.948007] Call Trace:
[ 240.948007] <IRQ>
[ 240.948007] [<ffffffff812cd5e0>] dev_hard_start_xmit+0x2a0/0x590
[ 240.948007] [<ffffffff8131f680>] ? arp_create+0x70/0x200
[ 240.948007] [<ffffffff812e8e1f>] sch_direct_xmit+0xef/0x1c0
Addresses: https://bugzilla.kernel.org/show_bug.cgi?id=41212
Signed-off-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index 43f89ba0a908..fe89c4660d55 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -717,11 +717,13 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct ipoib_dev_priv *priv = netdev_priv(dev); struct ipoib_neigh *neigh; - struct neighbour *n; + struct neighbour *n = NULL; unsigned long flags; - n = dst_get_neighbour(skb_dst(skb)); - if (likely(skb_dst(skb) && n)) { + if (likely(skb_dst(skb))) + n = dst_get_neighbour(skb_dst(skb)); + + if (likely(n)) { if (unlikely(!*to_ipoib_neigh(n))) { ipoib_path_lookup(skb, dev); return NETDEV_TX_OK; |