diff options
| author | James Bottomley <James.Bottomley@suse.de> | 2011-05-01 09:42:07 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-05-09 15:06:51 -0700 |
| commit | a4dbc2902ff426f9ded7542eeb3f347442f7fc1f (patch) | |
| tree | 4024707383dd03a4736071ab29cf0d6ea00937c5 | |
| parent | 8bd26179f756612921ff54dbf4f9d2bd0afa01cd (diff) | |
fix oops in scsi_run_queue()
commit c055f5b2614b4f758ae6cc86733f31fa4c2c5844 upstream.
The recent commit closing the race window in device teardown:
commit 86cbfb5607d4b81b1a993ff689bbd2addd5d3a9b
Author: James Bottomley <James.Bottomley@suse.de>
Date: Fri Apr 22 10:39:59 2011 -0500
[SCSI] put stricter guards on queue dead checks
is causing a potential NULL deref in scsi_run_queue() because the
q->queuedata may already be NULL by the time this function is called.
Since we shouldn't be running a queue that is being torn down, simply
add a NULL check in scsi_run_queue() to forestall this.
Tested-by: Jim Schutt <jaschut@sandia.gov>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index fb2bb35c62c..415fdf2bd94 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -400,10 +400,15 @@ static inline int scsi_host_is_busy(struct Scsi_Host *shost) static void scsi_run_queue(struct request_queue *q) { struct scsi_device *sdev = q->queuedata; - struct Scsi_Host *shost = sdev->host; + struct Scsi_Host *shost; LIST_HEAD(starved_list); unsigned long flags; + /* if the device is dead, sdev will be NULL, so no queue to run */ + if (!sdev) + return; + + shost = sdev->host; if (scsi_target(sdev)->single_lun) scsi_single_lun_run(sdev); |