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authorEwan D. Milne <emilne@redhat.com>2015-01-15 10:02:12 -0500
committerChristoph Hellwig <hch@lst.de>2015-01-20 09:04:21 +0100
commit91724c20613484555ba7e7b3d8549dac1e24f7a8 (patch)
tree43c97b70855b1932396e98208671d7804a696e67
parent99531e6063283da4468741185fe48b8eb037d919 (diff)
downloadlinux-91724c20613484555ba7e7b3d8549dac1e24f7a8.tar.gz
scsi: Avoid crashing if device uses DIX but adapter does not support it
This can happen if a multipathed device uses DIX and another path is added via an adapter that does not support it. Multipath should not allow this path to be added, but we should not depend upon that to avoid crashing. Signed-off-by: Ewan D. Milne <emilne@redhat.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
-rw-r--r--drivers/scsi/scsi_lib.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 6d5c0b8cb0b..17bb541f7cc 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1143,7 +1143,17 @@ int scsi_init_io(struct scsi_cmnd *cmd)
struct scsi_data_buffer *prot_sdb = cmd->prot_sdb;
int ivecs, count;
- BUG_ON(prot_sdb == NULL);
+ if (prot_sdb == NULL) {
+ /*
+ * This can happen if someone (e.g. multipath)
+ * queues a command to a device on an adapter
+ * that does not support DIX.
+ */
+ WARN_ON_ONCE(1);
+ error = BLKPREP_KILL;
+ goto err_exit;
+ }
+
ivecs = blk_rq_count_integrity_sg(rq->q, rq->bio);
if (scsi_alloc_sgtable(prot_sdb, ivecs, is_mq)) {