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| author | Ming Lei <ming.lei@redhat.com> | 2021-06-09 14:30:46 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-06-18 08:50:13 -0600 |
| commit | f0c1c4d2864ed614f90d2da1bab1a1c42907b940 (patch) | |
| tree | 85839bf9a39f116ce20217df43d358ad4571e41c /block/elevator.c | |
| parent | 828615950b5876e75587fdd5e9d1185be9cabba7 (diff) | |
| download | linux-f0c1c4d2864ed614f90d2da1bab1a1c42907b940.tar.bz2 | |
blk-mq: fix use-after-free in blk_mq_exit_sched
tagset can't be used after blk_cleanup_queue() is returned because
freeing tagset usually follows blk_clenup_queue(). Commit d97e594c5166
("blk-mq: Use request queue-wide tags for tagset-wide sbitmap") adds
check on q->tag_set->flags in blk_mq_exit_sched(), and causes
use-after-free.
Fixes it by using hctx->flags.
Reported-by: syzbot+77ba3d171a25c56756ea@syzkaller.appspotmail.com
Fixes: d97e594c5166 ("blk-mq: Use request queue-wide tags for tagset-wide sbitmap")
Cc: John Garry <john.garry@huawei.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Tested-by: John Garry <john.garry@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/20210609063046.122843-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/elevator.c')
0 files changed, 0 insertions, 0 deletions