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[SCSI] scsi_lib: fix potential NULL dereference 

Stanse found a potential NULL dereference in scsi_kill_request.

Instead of triggering BUG() in 'if (unlikely(cmd == NULL))' branch,
the kernel will Oops earlier on cmd dereference.

Move the dereferences after the if.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Jiri Slaby 2009-09-23 16:15:35 +02:00 committed by James Bottomley
parent f619106bdd
commit 03b147083a
1 changed files with 6 additions and 3 deletions
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9
drivers/scsi/scsi_lib.c
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@ -1359,9 +1359,9 @@ static int scsi_lld_busy(struct request_queue *q)
static void scsi_kill_request(struct request *req, struct request_queue *q) static void scsi_kill_request(struct request *req, struct request_queue *q)
{ {
struct scsi_cmnd *cmd = req->special; struct scsi_cmnd *cmd = req->special;
struct scsi_device *sdev = cmd->device; struct scsi_device *sdev;
struct scsi_target *starget = scsi_target(sdev); struct scsi_target *starget;
struct Scsi_Host *shost = sdev->host; struct Scsi_Host *shost;
blk_start_request(req); blk_start_request(req);
@ -1371,6 +1371,9 @@ static void scsi_kill_request(struct request *req, struct request_queue *q)
BUG(); BUG();
} }
sdev = cmd->device;
starget = scsi_target(sdev);
shost = sdev->host;
scsi_init_cmd_errh(cmd); scsi_init_cmd_errh(cmd);
cmd->result = DID_NO_CONNECT << 16; cmd->result = DID_NO_CONNECT << 16;
atomic_inc(&cmd->device->iorequest_cnt); atomic_inc(&cmd->device->iorequest_cnt);