Re: [PATCH] NFC: Prevent NULL deref when getting socket name

[John W. Linville]

On Sat, Jun 30, 2012 at 11:56:47AM +0200, Sasha Levin wrote:
> llcp_sock_getname can be called without a device attached to the nfc_llcp_sock.
> 
> This would lead to the following BUG:
> 
> [  362.341807] BUG: unable to handle kernel NULL pointer dereference at           (null)
> [  362.341815] IP: [<ffffffff836258e5>] llcp_sock_getname+0x75/0xc0
> [  362.341818] PGD 31b35067 PUD 30631067 PMD 0
> [  362.341821] Oops: 0000 [#627] PREEMPT SMP DEBUG_PAGEALLOC
> [  362.341826] CPU 3
> [  362.341827] Pid: 7816, comm: trinity-child55 Tainted: G      D W    3.5.0-rc4-next-20120628-sasha-00005-g9f23eb7 #479
> [  362.341831] RIP: 0010:[<ffffffff836258e5>]  [<ffffffff836258e5>] llcp_sock_getname+0x75/0xc0
> [  362.341832] RSP: 0018:ffff8800304fde88  EFLAGS: 00010286
> [  362.341834] RAX: 0000000000000000 RBX: ffff880033cb8000 RCX: 0000000000000001
> [  362.341835] RDX: ffff8800304fdec4 RSI: ffff8800304fdec8 RDI: ffff8800304fdeda
> [  362.341836] RBP: ffff8800304fdea8 R08: 7ebcebcb772b7ffb R09: 5fbfcb9c35bdfd53
> [  362.341838] R10: 4220020c54326244 R11: 0000000000000246 R12: ffff8800304fdec8
> [  362.341839] R13: ffff8800304fdec4 R14: ffff8800304fdec8 R15: 0000000000000044
> [  362.341841] FS:  00007effa376e700(0000) GS:ffff880035a00000(0000) knlGS:0000000000000000
> [  362.341843] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  362.341844] CR2: 0000000000000000 CR3: 0000000030438000 CR4: 00000000000406e0
> [  362.341851] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [  362.341856] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [  362.341858] Process trinity-child55 (pid: 7816, threadinfo ffff8800304fc000, task ffff880031270000)
> [  362.341858] Stack:
> [  362.341862]  ffff8800304fdea8 ffff880035156780 0000000000000000 0000000000001000
> [  362.341865]  ffff8800304fdf78 ffffffff83183b40 00000000304fdec8 0000006000000000
> [  362.341868]  ffff8800304f0027 ffffffff83729649 ffff8800304fdee8 ffff8800304fdf48
> [  362.341869] Call Trace:
> [  362.341874]  [<ffffffff83183b40>] sys_getpeername+0xa0/0x110
> [  362.341877]  [<ffffffff83729649>] ? _raw_spin_unlock_irq+0x59/0x80
> [  362.341882]  [<ffffffff810f342b>] ? do_setitimer+0x23b/0x290
> [  362.341886]  [<ffffffff81985ede>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> [  362.341889]  [<ffffffff8372a539>] system_call_fastpath+0x16/0x1b
> [  362.341921] Code: 84 00 00 00 00 00 b8 b3 ff ff ff 48 85 db 74 54 66 41 c7 04 24 27 00 49 8d 7c 24 12 41 c7 45 00 60 00 00 00 48 8b 83 28 05 00 00 <8b> 00 41 89 44 24 04 0f b6 83 41 05 00 00 41 88 44 24 10 0f b6
> [  362.341924] RIP  [<ffffffff836258e5>] llcp_sock_getname+0x75/0xc0
> [  362.341925]  RSP <ffff8800304fde88>
> [  362.341926] CR2: 0000000000000000
> [  362.341928] ---[ end trace 6d450e935ee18bf3 ]---
> 
> Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>

Samuel, I'm taking this one directly.

-- 
John W. Linville		Someday the world will need a hero, and you
linville@xxxxxxxxxxxxx			might be all we have.  Be ready.
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