From 9fe3348299de0836cd025c65cee18c49e84b5838 Mon Sep 17 00:00:00 2001
From: paulhsia <paulhsia@chromium.org>
Date: Fri, 29 Nov 2019 01:33:42 +0800
Subject: [PATCH] ucm: Use strncmp to avoid access-out-of-boundary

If the length of the identifier is less than the length of the prefix,
access-out-of-boundary will occur in memcmp().

Signed-off-by: paulhsia <paulhsia@chromium.org>
---
 src/ucm/main.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/ucm/main.c b/src/ucm/main.c
index 99b1cd08..c78f917a 100644
--- a/src/ucm/main.c
+++ b/src/ucm/main.c
@@ -60,11 +60,13 @@ static int check_identifier(const char *identifier, const char *prefix)
 {
 	int len;
 
-	if (strcmp(identifier, prefix) == 0)
-		return 1;
 	len = strlen(prefix);
-	if (memcmp(identifier, prefix, len) == 0 && identifier[len] == '/')
+	if (strncmp(identifier, prefix, len) != 0)
+		return 0;
+
+	if (identifier[len] == 0 || identifier[len] == '/')
 		return 1;
+
 	return 0;
 }
 
-- 
2.24.0.393.g34dc348eaf-goog