From d244f3dbd6cfd241dc1db611c0325daedfcab9c6 Mon Sep 17 00:00:00 2001
From: Dong Du <Dd_nirvana@sjtu.edu.cn>
Date: Thu, 29 Jul 2021 00:15:35 +0800
Subject: [PATCH] lib: sbi: Fix bug in strncmp function when count is 0

No need to compare characters when the count turns to 0.
Fix the issue in sbi_strncmp.

Signed-off-by: Dong Du <Dd_nirvana@sjtu.edu.cn>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
---
 lib/sbi/sbi_string.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/sbi/sbi_string.c b/lib/sbi/sbi_string.c
index 7805ba4..c87bce9 100644
--- a/lib/sbi/sbi_string.c
+++ b/lib/sbi/sbi_string.c
@@ -33,6 +33,10 @@ int sbi_strncmp(const char *a, const char *b, size_t count)
 	for (; count > 0 && *a == *b && *a != '\0'; a++, b++, count--)
 		;
 
+	/* No difference till the end */
+	if (!count)
+		return 0;
+
 	return *a - *b;
 }
 
-- 
2.7.4