linux-kernel - Re: NULL pointer dereference at fat

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Date:	Wed, 31 Oct 2012 09:49:47 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Stanislaw Gruszka <sgruszka@...hat.com>,
	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Eric Paris <eparis@...isplace.org>
Subject: Re: NULL pointer dereference at fat_detach

Paul Bolle <pebolle@...cali.nl> writes:

>> BUG: unable to handle kernel NULL pointer dereference at 0000009c
>> IP: [<c046d983>] do_raw_spin_lock+0xd/0x1e
>> 
>> [<c07fcc94>] _raw_spin_lock+0xd/0xf
>> [<f8fe03de>] fat_detach+0x20/0x59 [fat]
>> [<f8fe0874>] fat_evict_inode+0x5b/0x5e [fat]
>> [<c05058ad>] evict+0x57/0xe9
>> [<c0505a67>] iput+0xf8/0xfd
>> [<c051ce0f>] fsnotify_destroy_mark+0xdf/0xf8
>> [<c051e488>] sys_inotify_rm_watch+0x59/0x79
>> [<c07fcfbc>] syscall_call+0x7/0xb
>> 
>> what most likely indicate that fat_evict is called with
>> inode with i_sb->s_fs_info == NULL.

This bug is known as the inotify bug. I recall I talked about this,
maybe years ago.

Eric?
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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