x86: WARNING: kmemcheck: Caught 8-bit read from freed memory

[Shaohua Li]

I got this with kmemcheck enabled. the info->device in
fb_is_primary_device isn't a pci device.

Thanks,
Shaohua

WARNING: kmemcheck: Caught 8-bit read from freed memory
(ffff88003b8a2020)
414354494f4e3d61646400444556504154483d2f646576696365732f706c6174
 f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f
 ^

Pid: 1, comm: swapper Tainted: G        W    3.2.0-rc1+ #531 Dell Inc.
Studio XPS 8000/0X231R
RIP: 0010:[<ffffffff817af82d>]  [<ffffffff817af82d>]
fb_is_primary_device+0x1d/0x30
RSP: 0018:ffff88003da53c60  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88003c18f000 RCX: dead000000200200
RDX: ffff88003b8a1b80 RSI: 2222222222222222 RDI: ffff88003c18f000
RBP: ffff88003da53c60 R08: 2222222222222222 R09: 2222222222222222
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88003b8a1c10
R13: 0000000000000000 R14: ffff88003c18f350 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88003fa00000(0000)
knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffff88003d5c2000 CR3: 0000000001d35000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
 [<ffffffff8146067c>] do_register_framebuffer+0x4c/0x2d0
 [<ffffffff81460922>] register_framebuffer+0x22/0x40
 [<ffffffff818d6d9a>] vga16fb_probe+0x25d/0x2cc
 [<ffffffff81506c82>] platform_drv_probe+0x12/0x20
 [<ffffffff81505583>] really_probe+0x63/0x180
 [<ffffffff81505853>] driver_probe_device+0x23/0x30
 [<ffffffff8150595b>] __device_attach+0x4b/0x60
 [<ffffffff815043b4>] bus_for_each_drv+0x64/0x90
 [<ffffffff81505771>] device_attach+0xa1/0xb0
 [<ffffffff81504de5>] bus_probe_device+0x25/0x40
 [<ffffffff81503117>] device_add+0x307/0x410
 [<ffffffff81507550>] platform_device_add+0x110/0x1f0
 [<ffffffff81e64fde>] vga16fb_init+0x88/0xb3
 [<ffffffff810002c0>] do_one_initcall+0x40/0x180
 [<ffffffff81e3bc4c>] kernel_init+0xcb/0x150
 [<ffffffff81904134>] kernel_thread_helper+0x4/0x10
 [<ffffffffffffffff>] 0xffffffffffffffff


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