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(parent: 6fb845f) | patch
block: avoid to READ fields of null bio
authorMing Lei <ming.lei@redhat.com>
Tue, 19 Feb 2019 03:08:19 +0000 (11:08 +0800)
committerJens Axboe <axboe@kernel.dk>
Tue, 19 Feb 2019 16:19:06 +0000 (09:19 -0700)
commit49b1f22b567ba1d7d8174950be4398a69d0effb7
tree52811398366d5cc858edaebe17ca7cb1238a9777tree | snapshot
parent6fb845f0e78de19eaaf6a2d351702474e44b6a9ecommit | diff
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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