[PATCH for-6.12 0/4] block, bfq: fix corner cases related to bfqq merging

[Yu Kuai]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

Our syzkaller report a UAF problem(details in patch 1), however it can't
be reporduced. And this set are some corner cases fix that might be
related, and they are found by code review.

Yu Kuai (4):
  block, bfq: fix possible UAF for bfqq->bic with merge chain
  block, bfq: choose the last bfqq from merge chain in
    bfq_setup_cooperator()
  block, bfq: don't break merge chain in bfq_split_bfqq()
  block, bfq: use bfq_reassign_last_bfqq() in bfq_bfqq_move()

 block/bfq-cgroup.c  |  7 +------
 block/bfq-iosched.c | 17 +++++++++++------
 block/bfq-iosched.h |  2 ++
 3 files changed, 14 insertions(+), 12 deletions(-)

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2.39.2