From 151e397051c98baaae4fdc0fe3e40e20c311a8f3 Mon Sep 17 00:00:00 2001 From: "Ewan D. Milne" Date: Thu, 15 Jan 2015 10:02:12 -0500 Subject: [PATCH] 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 Reviewed-by: Martin K. Petersen Signed-off-by: Christoph Hellwig --- drivers/scsi/scsi_lib.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 6d5c0b8cb0bb4..17bb541f7cc25 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)) { -- 2.39.5