diff options
| author | Chengming Zhou <zhouchengming@bytedance.com> | 2023-09-08 08:57:02 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-09-11 16:17:34 -0600 |
| commit | 6be6d112419713334ddd9c01f219ca16adaa4c76 (patch) | |
| tree | 18d2b39d8bd624ce27fa3779e95860aed42db0b0 /drivers/auxdisplay | |
| parent | 0bb80ecc33a8fb5a682236443c1e740d5c917d1d (diff) | |
blk-mq: fix tags UAF when shrinking q->nr_hw_queues
When nr_hw_queues shrink, we free the excess tags before realloc'ing
hw_ctxs for each queue. During that resize, we may need to access those
tags, like blk_mq_tag_idle(hctx) will access queue shared tags.
This can cause a slab use-after-free, as reported by KASAN. Fix it by
moving the releasing of excess tags to the end.
Fixes: e1dd7bc93029 ("blk-mq: fix tags leak when shrink nr_hw_queues")
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Closes: https://lore.kernel.org/all/CAHj4cs_CK63uoDpGBGZ6DN4OCTpzkR3UaVgK=LX8Owr8ej2ieQ@mail.gmail.com/
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20230908005702.2183908-1-chengming.zhou@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/auxdisplay')
0 files changed, 0 insertions, 0 deletions