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blk-mq: fix use-after-free in blk_mq_free_tag_set()

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tags is freed in blk_mq_free_rq_map() and should not be used after that.
The problem doesn't manifest if CONFIG_CPUMASK_OFFSTACK is false because
free_cpumask_var() is nop.

tags->cpumask is allocated in blk_mq_init_tags() so it's natural to
free cpumask in its counter part, blk_mq_free_tags().

Fixes: f26cdc8536 ("blk-mq: Shared tag enhancements")
Signed-off-by: Jun'ichi Nomura <[email protected]>
Cc: Keith Busch <[email protected]>
Reviewed-by: Jeff Moyer <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Junichi Nomura 2015-10-14 05:02:15 +00:00 • committed by Jens Axboe
commit f42d79ab67
2 changed files with 2 additions and 3 deletions
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1
block/blk-mq-tag.c
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@ -641,6 +641,7 @@ void blk_mq_free_tags(struct blk_mq_tags *tags)
{
bt_free(&tags->bitmap_tags);
bt_free(&tags->breserved_tags);
free_cpumask_var(tags->cpumask);
kfree(tags);
}

4
block/blk-mq.c
View file

@ -2296,10 +2296,8 @@ void blk_mq_free_tag_set(struct blk_mq_tag_set *set)
int i;
for (i = 0; i < set->nr_hw_queues; i++) {
if (set->tags[i]) {
if (set->tags[i])
blk_mq_free_rq_map(set, set->tags[i], i);
free_cpumask_var(set->tags[i]->cpumask);
}
}
kfree(set->tags);