linux-kernel - [PATCH 3.12 175/206] scsi: Fix error handling in SCSI_IOCTL_SEND

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Date:	Tue, 18 Nov 2014 15:08:50 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>,
	Jens Axboe <axboe@...nel.dk>, linux-scsi@...r.kernel.org,
	Jiri Slaby <jslaby@...e.cz>, Jens Axboe <axboe@...com>
Subject: [PATCH 3.12 175/206] scsi: Fix error handling in SCSI_IOCTL_SEND_COMMAND

From: Jan Kara <jack@...e.cz>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 84ce0f0e94ac97217398b3b69c21c7a62ebeed05 upstream.

When sg_scsi_ioctl() fails to prepare request to submit in
blk_rq_map_kern() we jump to a label where we just end up copying
(luckily zeroed-out) kernel buffer to userspace instead of reporting
error. Fix the problem by jumping to the right label.

CC: Jens Axboe <axboe@...nel.dk>
CC: linux-scsi@...r.kernel.org
Coverity-id: 1226871
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>

Fixed up the, now unused, out label.

Signed-off-by: Jens Axboe <axboe@...com>
---
 block/scsi_ioctl.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index a5ffcc988f0b..1b4988b4bc11 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -506,7 +506,7 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 
 	if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 		err = DRIVER_ERROR << 24;
-		goto out;
+		goto error;
 	}
 
 	memset(sense, 0, sizeof(sense));
@@ -516,7 +516,6 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 
 	blk_execute_rq(q, disk, rq, 0);
 
-out:
 	err = rq->errors & 0xff;	/* only 8 bit SCSI status */
 	if (err) {
 		if (rq->sense_len && rq->sense) {
-- 
2.1.3

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