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authorJohn Garry <john.garry@huawei.com>2021-10-22 16:12:20 +0800
committerJens Axboe <axboe@kernel.dk>2021-10-22 09:16:12 -0600
commit8bdf7b3fe1f48a2c1c212d4685903bba01409c0e (patch)
treeb61883643451dd4af6a15cc5e717c27eaec6f5a5 /block
parent297db731847e7808881ec2123c7564067d594d39 (diff)
blk-mq-sched: Don't reference queue tagset in blk_mq_sched_tags_teardown()
We should not reference the queue tagset in blk_mq_sched_tags_teardown() (see function comment) for the blk-mq flags, so use the passed flags instead. This solves a use-after-free, similarly fixed earlier (and since broken again) in commit f0c1c4d2864e ("blk-mq: fix use-after-free in blk_mq_exit_sched"). Reported-by: Linux Kernel Functional Testing <lkft@linaro.org> Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Tested-by: Anders Roxell <anders.roxell@linaro.org> Fixes: e155b0c238b2 ("blk-mq: Use shared tags for shared sbitmap support") Signed-off-by: John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1634890340-15432-1-git-send-email-john.garry@huawei.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq-sched.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index 5b259fdea794..c62b966dfaba 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -541,7 +541,7 @@ static void blk_mq_sched_tags_teardown(struct request_queue *q, unsigned int fla
queue_for_each_hw_ctx(q, hctx, i) {
if (hctx->sched_tags) {
- if (!blk_mq_is_shared_tags(q->tag_set->flags))
+ if (!blk_mq_is_shared_tags(flags))
blk_mq_free_rq_map(hctx->sched_tags);
hctx->sched_tags = NULL;
}