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scsi: bsg: Fix commands without data transfer in scsi_bsg_sg_io_fn() 

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

Link: https://lore.kernel.org/r/20210731074027.1185545-2-hch@lst.de
Fixes: 75ca56409e ("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 09:40:26 +02:00 committed by Martin K. Petersen
parent 1084514ca9
commit 5c0f61377b
1 changed files with 1 additions and 0 deletions
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drivers/scsi/scsi_bsg.c
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@ -47,6 +47,7 @@ static int scsi_bsg_sg_io_fn(struct request_queue *q, struct sg_io_v4 *hdr,
if (!scsi_cmd_allowed(sreq->cmd, mode))
goto out_free_cmd;
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);