From: Wu Bo <wubo40@huawei.com>
To: <tj@kernel.org>, <axboe@kernel.dk>
Cc: <cgroups@vger.kernel.org>, <linux-block@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <liuzhiqiang26@huawei.com>,
<linfeilong@huawei.com>, <wubo40@huawei.com>
Subject: [PATCH] blkcg:fixes memory leaks in blkg_conf_prep()
Date: Fri, 15 May 2020 20:24:03 +0800 [thread overview]
Message-ID: <1589545443-151387-1-git-send-email-wubo40@huawei.com> (raw)
blkg_conf_prep():
new_blkg = blkg_alloc(pos, q, GFP_KERNEL);
...
blkg = blkg_lookup_check(pos, pol, q);
if (IS_ERR(blkg)) {
ret = PTR_ERR(blkg);
goto fail_unlock;
}
...
if calling blkg_lookup_check() failed, at the IS_ERR block,
the new_blkg should be free before goto lable fail_unlock
in blkg_conf_prep() function.
Signed-off-by: Wu Bo <wubo40@huawei.com>
---
block/blk-cgroup.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 930212c..afeb769 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -682,6 +682,7 @@ 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;
}
--
1.8.3.1
reply other threads:[~2020-05-15 12:10 UTC|newest]
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