4.14-stable review patch. If anyone has any objections, please let me know.
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From: Konstantin Khlebnikov khlebnikov@yandex-team.ru
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
--- block/bfq-cgroup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/block/bfq-cgroup.c +++ b/block/bfq-cgroup.c @@ -224,9 +224,9 @@ static void bfqg_and_blkg_get(struct bfq
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,