autofs ioctl() => impossibly large user copy

[Tommi Rantala]

Hello,

Saw this WARNING while fuzzing the kernel with trinity in qemu virtual
machine as the root user:

[  392.585489] ------------[ cut here ]------------
[  392.586464] WARNING: at
/home/ttrantal/git/linux-2.6/mm/page_alloc.c:2376
__alloc_pages_nodemask+0x20e/0x970()
[  392.588446] Hardware name: Bochs
[  392.589170] Pid: 2811, comm: trinity-child12 Not tainted 3.8.0+ #87
[  392.590486] Call Trace:
[  392.591023]  [<ffffffff81097b86>] warn_slowpath_common+0x86/0xb0
[  392.592374]  [<ffffffff81097c75>] warn_slowpath_null+0x15/0x20
[  392.593507]  [<ffffffff81159b8e>] __alloc_pages_nodemask+0x20e/0x970
[  392.594650]  [<ffffffff810d51a5>] ? sched_clock_local+0x25/0xa0
[  392.595862]  [<ffffffff810f5b18>] ? trace_hardirqs_off_caller+0x28/0xd0
[  392.597304]  [<ffffffff810f5b18>] ? trace_hardirqs_off_caller+0x28/0xd0
[  392.599000]  [<ffffffff8118fba4>] alloc_pages_current+0x124/0x150
[  392.600547]  [<ffffffff81156639>] __get_free_pages+0x9/0x50
[  392.601927]  [<ffffffff81195779>] kmalloc_order_trace+0x39/0xd0
[  392.603501]  [<ffffffff81197f46>] __kmalloc_track_caller+0x46/0x1d0
[  392.605203]  [<ffffffff812d2b7a>] ? _autofs_dev_ioctl+0x9a/0x3e0
[  392.606724]  [<ffffffff8116b44b>] memdup_user+0x2b/0x80
[  392.608076]  [<ffffffff8117a1f0>] ? might_fault+0x40/0x90
[  392.609403]  [<ffffffff812d2b7a>] _autofs_dev_ioctl+0x9a/0x3e0
[  392.610845]  [<ffffffff812fb640>] ? avc_has_perm_flags+0x1d0/0x2a0
[  392.612380]  [<ffffffff812fb498>] ? avc_has_perm_flags+0x28/0x2a0
[  392.613817]  [<ffffffff812d2ece>] autofs_dev_ioctl+0xe/0x20
[  392.615191]  [<ffffffff811b5ff2>] do_vfs_ioctl+0x532/0x580
[  392.616554]  [<ffffffff812fc7d3>] ? file_has_perm+0x83/0xa0
[  392.617623]  [<ffffffff811b609d>] sys_ioctl+0x5d/0xa0
[  392.618599]  [<ffffffff813571de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[  392.619796]  [<ffffffff81ca07e9>] system_call_fastpath+0x16/0x1b
[  392.620956] ---[ end trace 6628336fa0115cb7 ]---

Tommi
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