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From:   Chuhong Yuan <hslester96@gmail.com>
Cc:     linux-kernel@vger.kernel.org, Chuhong Yuan <hslester96@gmail.com>
Subject: [PATCH 11/12] userns: Replace strncmp with str_has_prefix
Date:   Mon, 29 Jul 2019 23:15:27 +0800
Message-Id: <20190729151527.9822-1-hslester96@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
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strncmp(str, const, len) is error-prone.
We had better use newly introduced
str_has_prefix() instead of it.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
---
 kernel/user_namespace.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 8eadadc478f9..4a06ba563531 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -1153,11 +1153,10 @@ ssize_t proc_setgroups_write(struct file *file, const char __user *buf,
 
 	/* What is being requested? */
 	ret = -EINVAL;
-	if (strncmp(pos, "allow", 5) == 0) {
+	if (str_has_prefix(pos, "allow")) {
 		pos += 5;
 		setgroups_allowed = true;
-	}
-	else if (strncmp(pos, "deny", 4) == 0) {
+	} else if (str_has_prefix(pos, "deny")) {
 		pos += 4;
 		setgroups_allowed = false;
 	}
-- 
2.20.1