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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2018-09-06 11:05:44 +0300
committerJens Axboe <axboe@kernel.dk>2018-09-06 11:32:58 -0600
commitd5274b3cd6a814ccb2f56d81ee87cbbf51bd4cf7 (patch)
tree0b89b27d5406615c5c235347583086bb6e3c7815 /block/bfq-cgroup.c
parent8b2ded1c94c06f841f8c1612bcfa33c85012a36b (diff)
downloadlinux-d5274b3cd6a814ccb2f56d81ee87cbbf51bd4cf7.tar.bz2
block: bfq: swap puts in bfqg_and_blkg_put
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>
Diffstat (limited to 'block/bfq-cgroup.c')
-rw-r--r--block/bfq-cgroup.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index 58c6efa9f9a9..9fe5952d117d 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -275,9 +275,9 @@ 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);
}
/* @stats = 0 */