scsi: Fix error handling in SCSI_IOCTL_SEND_COMMAND

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@kernel.dk>
CC: linux-scsi@vger.kernel.org
Coverity-id: 1226871
Signed-off-by: Jan Kara <jack@suse.cz>
Fixed up the, now unused, out label.

Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from commit d73b032b63e8967462e1cf5763858ed89e97880f)

Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 123eb173e8c12b424f84e4b06ebb15de85e50b1e..f5df2a888631f58960a7314dab175bb3881fcecf 100644 (file)
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -503,7 +503,7 @@ 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));
@@ -513,7 +513,6 @@ 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) {