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block: bfq: swap puts in bfqg_and_blkg_put

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commit d5274b3cd6a814ccb2f56d81ee87cbbf51bd4cf7 upstream.

Fix trivial use-after-free. This could be last reference to bfqg.

Fixes: 8f9bebc33dd7 ("block, bfq: access and cache blkg data only when safe")
Acked-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Konstantin Khlebnikov 2018-09-06 11:05:44 +03:00 committed by Greg Kroah-Hartman
parent 23ecbbad7b
commit 381992bccc
1 changed files with 2 additions and 2 deletions
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block/bfq-cgroup.c
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@ -224,9 +224,9 @@ static void bfqg_and_blkg_get(struct bfq_group *bfqg)
void bfqg_and_blkg_put(struct bfq_group *bfqg)
{
bfqg_put(bfqg);
blkg_put(bfqg_to_blkg(bfqg));
bfqg_put(bfqg);
}
void bfqg_stats_update_io_add(struct bfq_group *bfqg, struct bfq_queue *bfqq,