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blk-cgroup: Fix memleak on error path 

[ Upstream commit 52abfcbd57 ]

If new_blkg allocation raced with blk_policy change and
blkg_lookup_check fails, new_blkg is leaked.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Gabriel Krisman Bertazi 2020-10-22 16:58:41 -04:00 committed by Greg Kroah-Hartman
parent 914fc55242
commit f77756ea66
1 changed files with 1 additions and 0 deletions
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block/blk-cgroup.c
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@ -861,6 +861,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
blkg = blkg_lookup_check(pos, pol, q);
if (IS_ERR(blkg)) {
ret = PTR_ERR(blkg);
blkg_free(new_blkg);
goto fail_unlock;
}