diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-02-09 15:07:18 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-02-09 15:07:18 -0800 |
| commit | 4906f9985e310fc01f956256b0d58ac28b0dcb19 (patch) | |
| tree | 574352344b50864d7f3b0056cef715bc428dcda0 | |
| parent | 20461c1740cac5e02733221c9f653098a703f55a (diff) | |
bridge: Fix LRO crash with tun
> Kernel BUG at drivers/net/tun.c:444
> invalid opcode: 0000 [1] SMP
> last sysfs file: /class/net/lo/ifindex
> CPU 0
> Modules linked in: tun ipt_MASQUERADE iptable_nat ip_nat xt_state ip_conntrack
> nfnetlink ipt_REJECT xt_tcpudp iptable_filter d
> Pid: 6912, comm: qemu-kvm Tainted: G 2.6.18-128.el5 #1
> RIP: 0010:[<ffffffff886f57b0>] [<ffffffff886f57b0>]
> :tun:tun_chr_readv+0x2b1/0x3a6
> RSP: 0018:ffff8102202c5e48 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffff8102202c5e98 RCX: 0000000004010000
> RDX: ffff810227063680 RSI: ffff8102202c5e9e RDI: ffff8102202c5e92
> RBP: 0000000000010ff6 R08: 0000000000000000 R09: 0000000000000001
> R10: ffff8102202c5e94 R11: 0000000000000202 R12: ffff8102275357c0
> R13: ffff81022755e500 R14: 0000000000000000 R15: ffff8102202c5ef8
> FS: 00002ae4398db980(0000) GS:ffffffff803ac000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00002ae4ab514000 CR3: 0000000221344000 CR4: 00000000000026e0
> Process qemu-kvm (pid: 6912, threadinfo ffff8102202c4000, task
> ffff81022e58d820)
> Stack: 00000000498735cb ffff810229d1a3c0 0000000000000000 ffff81022e58d820
> ffffffff8008a461 ffff81022755e528 ffff81022755e528 ffffffff8009f925
> 000005ea05ea0000 ffff8102209d0000 00001051143e1600 ffffffff8003c00e
> Call Trace:
> [<ffffffff8008a461>] default_wake_function+0x0/0xe
> [<ffffffff8009f925>] enqueue_hrtimer+0x55/0x70
> [<ffffffff8003c00e>] hrtimer_start+0xbc/0xce
> [<ffffffff886f58bf>] :tun:tun_chr_read+0x1a/0x1f
> [<ffffffff8000b3f3>] vfs_read+0xcb/0x171
> [<ffffffff800117d4>] sys_read+0x45/0x6e
> [<ffffffff8005d116>] system_call+0x7e/0x83
>
>
> Code: 0f 0b 68 40 62 6f 88 c2 bc 01 f6 42 0a 08 74 0c 80 4c 24 41
> RIP [<ffffffff886f57b0>] :tun:tun_chr_readv+0x2b1/0x3a6
> RSP <ffff8102202c5e48>
> <0>Kernel panic - not syncing: Fatal exception
This crashed when an LRO packet generated by bnx2x reached a
tun device through the bridge. We're supposed to drop it at
the bridge. However, because the check was placed in br_forward
instead of __br_forward, it's only effective if we are sending
the packet through a single port.
This patch fixes it by moving the check into __br_forward.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/bridge/br_forward.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c index bdd9ccea17c..d2c27c808d3 100644 --- a/net/bridge/br_forward.c +++ b/net/bridge/br_forward.c @@ -67,6 +67,11 @@ static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb) { struct net_device *indev; + if (skb_warn_if_lro(skb)) { + kfree_skb(skb); + return; + } + indev = skb->dev; skb->dev = to->dev; skb_forward_csum(skb); @@ -89,7 +94,7 @@ void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb) /* called with rcu_read_lock */ void br_forward(const struct net_bridge_port *to, struct sk_buff *skb) { - if (!skb_warn_if_lro(skb) && should_deliver(to, skb)) { + if (should_deliver(to, skb)) { __br_forward(to, skb); return; } |