[lkml]   [2012]   [Aug]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] fix NULL-pointer dereference on scsi_run_queue
On Thu, 2012-08-02 at 17:41 +0900, Chanho Min wrote:
> This patch is to fix a oops from a torn down device. When
> scsi_run_queue process starved queues, scsi_request_fn can race with
> scsi_remove_device. In this case, rarely, scsi_request_fn release the
> last reference and set sdev->request_queue to NULL. It result in
> NULL-pointer dereference when spin_unlock is tried with (NULL)->
> queue_lock. We need to add an extra reference to the device on both
> sides of the __blk_run_queue to hold reference until scsi_request_fn
> is finished.

You need a recent kernel with this patch:

commit 940f5d47e2f2e1fa00443921a0abf4822335b54d
Author: Bart Van Assche <>
Date: Fri Jun 29 15:34:26 2012 +0000

[SCSI] Avoid dangling pointer in scsi_requeue_command()


 \ /
  Last update: 2012-08-02 11:42    [W:0.077 / U:6.836 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site