[PATCH 4/4] bfq: Update cgroup information before merging bio

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When the process is migrated to a different cgroup (or in case of
writeback just starts submitting bios associated with a different
cgroup) bfq_merge_bio() can operate with stale cgroup information in
bic. Thus the bio can be merged to a request from a different cgroup or
it can result in merging of bfqqs for different cgroups or bfqqs of
already dead cgroups and causing possible use-after-free issues. Fix the
problem by updating cgroup information in bfq_merge_bio().

CC: stable@xxxxxxxxxxxxxxx
Fixes: e21b7a0b9887 ("block, bfq: add full hierarchical scheduling and cgroups support")
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
 block/bfq-iosched.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 361d321b012a..8a088d77a0b6 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -2337,10 +2337,17 @@ static bool bfq_bio_merge(struct request_queue *q, struct bio *bio,
 
 	spin_lock_irq(&bfqd->lock);
 
-	if (bic)
+	if (bic) {
+		/*
+		 * Make sure cgroup info is uptodate for current process before
+		 * considering the merge.
+		 */
+		bfq_bic_update_cgroup(bic, bio);
+
 		bfqd->bio_bfqq = bic_to_bfqq(bic, op_is_sync(bio->bi_opf));
-	else
+	} else {
 		bfqd->bio_bfqq = NULL;
+	}
 	bfqd->bio_bic = bic;
 
 	ret = blk_mq_sched_try_merge(q, bio, nr_segs, &free);
-- 
2.31.1




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