[SCSI] sg: fix bio leak with a detached device

After blk_rq_map_user is successful, if we find that a device is
unavailable (was detached), we must call blk_end_request_all to free
bio(s) before blk_rq_unmap_user and blk_put_request.

Reported-by: "Dailey, Nate" <Nate.Dailey@stratus.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Tested-by: "Dailey, Nate" <Nate.Dailey@stratus.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index ef752b248c4d..d4549092400c 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -729,6 +729,8 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp,
                 return k;       /* probably out of space --> ENOMEM */
         }
         if (sdp->detached) {
+                if (srp->bio)
+                        blk_end_request_all(srp->rq, -EIO);
                 sg_finish_rem_req(srp);
                 return -ENODEV;
         }