Make sure ->nr_integrity_segments is cloned in blk_rq_prep_clone(), otherwise requests cloned by device-mapper multipath will not have the proper nr_integrity_segments values set, then BUG() is hit from sg_alloc_table_chained().

Fixes: b0fd271d5fba ("block: add request clone interface (v2)") Cc: stable@vger.kernel.org Cc: Christoph Hellwig hch@infradead.org Signed-off-by: Ming Lei ming.lei@redhat.com --- V2: - rewords commit log(Christoph) - add fixes tag(Christoph)

block/blk-mq.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/block/blk-mq.c b/block/blk-mq.c index 40490ac88045..005c520d3498 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3314,6 +3314,7 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src, rq->special_vec = rq_src->special_vec; } rq->nr_phys_segments = rq_src->nr_phys_segments; + rq->nr_integrity_segments = rq_src->nr_integrity_segments;

if (rq->bio && blk_crypto_rq_bio_prep(rq, rq->bio, gfp_mask) < 0) goto free_and_out;