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blk-cgroup: Fix memleak on error path

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[ 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>
This commit is contained in:
Gabriel Krisman Bertazi
2020-11-10 12:39:04 +01:00
committed by Greg Kroah-Hartman
parent 9070c2bc48
commit 89c94a3a8e
1 changed files with 1 additions and 0 deletions
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block/blk-cgroup.c
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@@ -654,6 +654,7 @@ 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;
}