Commit f26cdc853 ("blk-mq: Shared tag enhancements") has introduced a use after
free where it tried to free the cpumask var out of the tag set but the tag set
was already freed by blk_mq_free_rq_map().
Signed-off-by: Sasha Levin <sasha.le...@oracle.com>
---
block/blk-mq-tag.c | 1 +
block/blk-mq.c | 7 ++-----
2 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index f6020c6..c03eeb8 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -628,6 +628,7 @@ 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);
}
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 5692c15..197a615 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2270,12 +2270,9 @@ 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]) {
+ for (i = 0; i < set->nr_hw_queues; 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);
set->tags = NULL;
--
1.7.10.4
--
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