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From:   YueHaibing <yuehaibing@huawei.com>
To:     <tj@kernel.org>, <lizefan.x@bytedance.com>, <hannes@cmpxchg.org>,
        <shuah@kernel.org>, <yosryahmed@google.com>,
        <roman.gushchin@linux.dev>, <shakeelb@google.com>,
        <rientjes@google.com>, <akpm@linux-foundation.org>
CC:     <cgroups@vger.kernel.org>, <linux-kselftest@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, YueHaibing <yuehaibing@huawei.com>
Subject: [PATCH] selftests: cgroup: Fix unsigned comparison with less than zero
Date:   Sat, 5 Nov 2022 19:06:11 +0800
Message-ID: <20221105110611.28920-1-yuehaibing@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

'size' is unsigned, it never less than zero.

Fixes: 6c26df84e1f2 ("selftests: cgroup: return -errno from cg_read()/cg_write() on failure")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 tools/testing/selftests/cgroup/cgroup_util.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
index 4c52cc6f2f9c..e8bbbdb77e0d 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.c
+++ b/tools/testing/selftests/cgroup/cgroup_util.c
@@ -555,6 +555,7 @@ int proc_mount_contains(const char *option)
 ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size)
 {
 	char path[PATH_MAX];
+	ssize_t ret;
 
 	if (!pid)
 		snprintf(path, sizeof(path), "/proc/%s/%s",
@@ -562,8 +563,8 @@ ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t
 	else
 		snprintf(path, sizeof(path), "/proc/%d/%s", pid, item);
 
-	size = read_text(path, buf, size);
-	return size < 0 ? -1 : size;
+	ret = read_text(path, buf, size);
+	return ret < 0 ? -1 : ret;
 }
 
 int proc_read_strstr(int pid, bool thread, const char *item, const char *needle)
-- 
2.17.1