linux-kernel - [PATCH 5/5] SCSI: scsi_lib, fix potential NULL dereference

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Date:	Wed, 23 Sep 2009 16:15:35 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	James.Bottomley@...e.de
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...il.com>
Subject: [PATCH 5/5] 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@...il.com>
Cc: James E.J. Bottomley <James.Bottomley@...e.de>
---
 drivers/scsi/scsi_lib.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 5987da8..98f601a 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -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)
 {
 	struct scsi_cmnd *cmd = req->special;
-	struct scsi_device *sdev = cmd->device;
-	struct scsi_target *starget = scsi_target(sdev);
-	struct Scsi_Host *shost = sdev->host;
+	struct scsi_device *sdev;
+	struct scsi_target *starget;
+	struct Scsi_Host *shost;
 
 	blk_start_request(req);
 
@@ -1371,6 +1371,9 @@ static void scsi_kill_request(struct request *req, struct request_queue *q)
 		BUG();
 	}
 
+	sdev = cmd->device;
+	starget = scsi_target(sdev);
+	shost = sdev->host;
 	scsi_init_cmd_errh(cmd);
 	cmd->result = DID_NO_CONNECT << 16;
 	atomic_inc(&cmd->device->iorequest_cnt);
-- 
1.6.4.2

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