linux-kernel - 2.6.32-rc8: pohmelfs: NULL pointer dereference

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Date:	Wed, 2 Dec 2009 04:11:52 +0300
From:	Alexander Beregalov <a.beregalov@...il.com>
To:	zbr@...emap.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	jens.axboe@...cle.com
Subject: 2.6.32-rc8: pohmelfs: NULL pointer dereference

Hi

BUG: unable to handle kernel NULL pointer dereference at 000000b8
IP: [<c10a96f9>] bdi_queue_work+0x9/0xa0

 [<c10a97e6>] ? sync_inodes_sb+0x46/0x120
 [<c13cbafd>] ? printk+0x18/0x1b
 [<f840d8cb>] ? pohmelfs_kill_super+0xb/0x20 [pohmelfs]
 [<c1090b8a>] ? deactivate_locked_super+0x4a/0x70
 [<c1090ccf>] ? get_sb_nodev+0x6f/0x80
 [<f840d8fc>] ? pohmelfs_get_sb+0x1c/0x20 [pohmelfs]
 [<f840e120>] ? pohmelfs_fill_super+0x0/0x530 [pohmelfs]
 [<c108fe50>] ? vfs_kern_mount+0x40/0xd0


The problem is that pohmelfs_fill_super() does not set sb->s_bdi.
Behavior was changed by
b6e51316da writeback: separate starting of sync vs opportunistic writeback
d8a8559cd7 writeback: get rid of generic_sync_sb_inodes() export
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