linux-kernel - [PATCH] cgroup: Fix an error handling path in alloc_pagecache_max

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Date:   Sun, 22 May 2022 16:18:51 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     dan.carpenter@...cle.com, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Shuah Khan <shuah@...nel.org>,
        David Vernet <void@...ifault.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: [PATCH] cgroup: Fix an error handling path in alloc_pagecache_max_30M()

If the first goto is taken, 'fd' is not opened yet (and is un-initialized).
So a direct return is safer.

Fixes: c1a31a2f7a9c ("cgroup: fix racy check in alloc_pagecache_max_30M() helper function")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 tools/testing/selftests/cgroup/test_memcontrol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index c3d0d5f7b19c..8833359556f3 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -448,7 +448,7 @@ static int alloc_pagecache_max_30M(const char *cgroup, void *arg)
 	high = cg_read_long(cgroup, "memory.high");
 	max = cg_read_long(cgroup, "memory.max");
 	if (high != MB(30) && max != MB(30))
-		goto cleanup;
+		return -1;
 
 	fd = get_temp_fd();
 	if (fd < 0)
-- 
2.34.1