netdev - ipqueue allocation failure.

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Date:	Tue, 19 Apr 2011 21:42:22 -0400
From:	Dave Jones <davej@...hat.com>
To:	netdev@...r.kernel.org
Subject: ipqueue allocation failure.

Not catastrophic, but ipqueue seems to be too trusting of what it gets
passed from userspace, and passes it on down to the page allocator,
where it will spew warnings if the page order is too high.

__ipq_rcv_skb has several checks for lengths too small, but doesn't
seem to have any for oversized ones.   I'm not sure what the maximum
we should check for is. I'll code up a diff if anyone has any ideas
on a sane maximum.

	Dave

------------[ cut here ]------------
WARNING: at mm/page_alloc.c:2032 __alloc_pages_nodemask+0x17d/0x7e6()
Hardware name: GA-MA78GM-S2H
Modules linked in: rfcomm hidp can_raw can_bcm sctp libcrc32c ip_queue decnet pppoe pppox ppp_generic slhc can ipx p8022 p8023 phonet bluetooth rfkill a]
Pid: 20393, comm: trinity Not tainted 2.6.39-rc4+ #6
Call Trace:
 [<ffffffff81056a9c>] warn_slowpath_common+0x83/0x9b
 [<ffffffff81056ace>] warn_slowpath_null+0x1a/0x1c
 [<ffffffff810ed743>] __alloc_pages_nodemask+0x17d/0x7e6
 [<ffffffff811206c9>] ? check_object+0x174/0x1ae
 [<ffffffff81120a43>] ? check_slab+0xc7/0xd5
 [<ffffffff813f42fe>] ? __alloc_skb+0x40/0x133
 [<ffffffff813f42fe>] ? __alloc_skb+0x40/0x133
 [<ffffffff814b7487>] kmalloc_large_node+0x56/0x95
 [<ffffffff811235c1>] __kmalloc_node_track_caller+0x32/0x139
 [<ffffffff81421b68>] ? netlink_ack+0x4a/0xe8
 [<ffffffffa0500475>] ? ipq_rcv_skb+0x27/0x340 [ip_queue]
 [<ffffffff813f4333>] __alloc_skb+0x75/0x133
 [<ffffffff81421b68>] netlink_ack+0x4a/0xe8
 [<ffffffffa050076a>] ipq_rcv_skb+0x31c/0x340 [ip_queue]
 [<ffffffff8142174a>] netlink_unicast+0xec/0x156
 [<ffffffff81421a33>] netlink_sendmsg+0x27f/0x2c0
 [<ffffffff813ed76c>] __sock_sendmsg+0x69/0x75
 [<ffffffff813ed834>] sock_aio_write+0xbc/0xcc
 [<ffffffff8113242b>] do_sync_write+0xbf/0xff
 [<ffffffff81206e18>] ? security_file_permission+0x2e/0x33
 [<ffffffff81132861>] ? rw_verify_area+0xb6/0xd3
 [<ffffffff81132b02>] vfs_write+0xb6/0xf6
 [<ffffffff8113400b>] ? fget_light+0x3a/0xa1
 [<ffffffff81132cf6>] sys_write+0x4d/0x74
 [<ffffffff814c5d82>] system_call_fastpath+0x16/0x1b
---[ end trace cd56dc75cfeab436 ]---

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