summaryrefslogtreecommitdiff
path: root/Documentation
diff options
context:
space:
mode:
authorYu Kuai <yukuai3@huawei.com>2023-03-08 05:32:08 +0300
committerJens Axboe <axboe@kernel.dk>2023-03-08 17:34:50 +0300
commite2f2a39452c43b64ea3191642a2661cb8d03827a (patch)
treebb85a3d9c05661e2c356f44fa95b0da4e059064d /Documentation
parente33062213ff2f9151e0d125e1c00f524c2b7acfe (diff)
downloadlinux-e2f2a39452c43b64ea3191642a2661cb8d03827a.tar.xz
block, bfq: fix uaf for 'stable_merge_bfqq'
Before commit fd571df0ac5b ("block, bfq: turn bfqq_data into an array in bfq_io_cq"), process reference is read before bfq_put_stable_ref(), and it's safe if bfq_put_stable_ref() put the last reference, because process reference will be 0 and 'stable_merge_bfqq' won't be accessed in this case. However, the commit changed the order and will cause uaf for 'stable_merge_bfqq'. In order to emphasize that bfq_put_stable_ref() can drop the last reference, fix the problem by moving bfq_put_stable_ref() to the end of bfq_setup_stable_merge(). Fixes: fd571df0ac5b ("block, bfq: turn bfqq_data into an array in bfq_io_cq") Reported-and-tested-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com> Link: https://lore.kernel.org/linux-block/20230307071448.rzihxbm4jhbf5krj@shindev/ Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions