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scsi: bsg-lib: Fix commands without data transfer in bsg_transport_sg_io_fn()

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Set ret to 0 after the initial permission checks to avoid leaking -EPERM
for commands without data transfer.

Link: https://lore.kernel.org/r/20210731074027.1185545-3-hch@lst.de
Fixes: 75ca56409e5b ("scsi: bsg: Move the whole request execution into the SCSI/transport handlers")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2021-07-31 09:40:27 +02:00 committed by Martin K. Petersen
parent 5c0f61377b
commit 659a37844a
1 changed files with 1 additions and 0 deletions
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block/bsg-lib.c
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@ -72,6 +72,7 @@ static int bsg_transport_sg_io_fn(struct request_queue *q, struct sg_io_v4 *hdr,
job->bidi_bio = NULL;
}
ret = 0;
if (hdr->dout_xfer_len) {
ret = blk_rq_map_user(rq->q, rq, NULL, uptr64(hdr->dout_xferp),
hdr->dout_xfer_len, GFP_KERNEL);