scsi: target: pscsi: Clean up after failure in pscsi_map_sg()

[ Upstream commit 36fa766faa0c822c860e636fe82b1affcd022974 ]

If pscsi_map_sg() fails, make sure to drop references to already allocated
bios.

Link: https://lore.kernel.org/r/20210323212431.15306-2-mwilck@suse.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index ef1c8c158f66b950fdf94c4d64d3510de3779f4d..079db0bd39174f6c1205c62224e476e82a5e2d0d 100644 (file)
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -951,6 +951,14 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 
        return 0;
 fail:
+       if (bio)
+               bio_put(bio);
+       while (req->bio) {
+               bio = req->bio;
+               req->bio = bio->bi_next;
+               bio_put(bio);
+       }
+       req->biotail = NULL;
        return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 }