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| H A D | blk-merge.c | diff 49b1f22b567ba1d7d8174950be4398a69d0effb7 Mon Feb 18 21:08:19 CST 2019 Ming Lei <ming.lei@redhat.com> block: avoid to READ fields of null bio
rq->bio can be NULL sometimes, such as flush request, so don't
read bio->bi_seg_front_size until this 'bio' is checked as valid.
Cc: Bart Van Assche <bvanassche@acm.org>
Reported-by: Bart Van Assche <bvanassche@acm.org>
Fixes: dcebd755926b0f39dd1e ("block: use bio_for_each_bvec() to compute multi-page bvec count")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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