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: dcebd755 ("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>
parent
6fb845f0
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