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fix regression in SCSI_IOCTL_SEND_COMMAND

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blk_rq_set_block_pc() memsets rq->cmd to 0, so it should come
immediately after blk_get_request() to avoid overwriting the
user-supplied CDB.  Also check for failure to allocate rq.

Fixes: f27b087b81 ("block: add blk_rq_set_block_pc()")
Cc: <stable@vger.kernel.org> # 3.16.x
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tony Battersby 2014-08-22 15:53:35 -04:00 committed by Jens Axboe
parent 6f4a16266f
commit 2ba136daa3
1 changed files with 7 additions and 2 deletions
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9
block/scsi_ioctl.c
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@ -456,6 +456,11 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
}
rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
if (!rq) {
err = -ENOMEM;
goto error;
}
blk_rq_set_block_pc(rq);
cmdlen = COMMAND_SIZE(opcode);
@ -509,7 +514,6 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
memset(sense, 0, sizeof(sense));
rq->sense = sense;
rq->sense_len = 0;
blk_rq_set_block_pc(rq);
blk_execute_rq(q, disk, rq, 0);
@ -529,7 +533,8 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
error:
kfree(buffer);
blk_put_request(rq);
if (rq)
blk_put_request(rq);
return err;
}
EXPORT_SYMBOL_GPL(sg_scsi_ioctl);