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| author | Ming Lei <ming.lei@redhat.com> | 2022-03-08 08:32:18 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-03-09 01:57:19 +0100 |
| commit | 4f481208749a22d3570073e629dbc27d7d27c8da (patch) | |
| tree | 8df524f2cca05a364031383731151d6b9b8775cc /block/blk-mq-sched.c | |
| parent | block: mtip32xx: don't touch q->queue_hw_ctx (diff) | |
| download | linux-4f481208749a22d3570073e629dbc27d7d27c8da.tar.xz linux-4f481208749a22d3570073e629dbc27d7d27c8da.zip | |
blk-mq: prepare for implementing hctx table via xarray
It is inevitable to cause use-after-free on q->queue_hw_ctx between
queue_for_each_hw_ctx() and blk_mq_update_nr_hw_queues(). And converting
to xarray can fix the uaf, meantime code gets cleaner.
Prepare for converting q->queue_hctx_ctx into xarray, one thing is that
xa_for_each() can only accept 'unsigned long' as index, so changes type
of hctx index of queue_for_each_hw_ctx() into 'unsigned long'.
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220308073219.91173-6-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-sched.c')
| -rw-r--r-- | block/blk-mq-sched.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index 55488ba97823..e6ad8f761474 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -515,7 +515,7 @@ static void blk_mq_exit_sched_shared_tags(struct request_queue *queue) static void blk_mq_sched_tags_teardown(struct request_queue *q, unsigned int flags) { struct blk_mq_hw_ctx *hctx; - int i; + unsigned long i; queue_for_each_hw_ctx(q, hctx, i) { if (hctx->sched_tags) { @@ -550,9 +550,10 @@ static int blk_mq_init_sched_shared_tags(struct request_queue *queue) int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e) { - unsigned int i, flags = q->tag_set->flags; + unsigned int flags = q->tag_set->flags; struct blk_mq_hw_ctx *hctx; struct elevator_queue *eq; + unsigned long i; int ret; if (!e) { @@ -618,7 +619,7 @@ err_free_map_and_rqs: void blk_mq_sched_free_rqs(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; - int i; + unsigned long i; if (blk_mq_is_shared_tags(q->tag_set->flags)) { blk_mq_free_rqs(q->tag_set, q->sched_shared_tags, @@ -635,7 +636,7 @@ void blk_mq_sched_free_rqs(struct request_queue *q) void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e) { struct blk_mq_hw_ctx *hctx; - unsigned int i; + unsigned long i; unsigned int flags = 0; queue_for_each_hw_ctx(q, hctx, i) { |