linux-kernel - [PATCH] xtensa: ISS: don't use string pointer before NULL check

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Message-Id: <20210810231903.5778-1-jcmvbkbc@gmail.com>
Date:   Tue, 10 Aug 2021 16:19:03 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-xtensa@...ux-xtensa.org
Cc:     Chris Zankel <chris@...kel.net>, linux-kernel@...r.kernel.org,
        Max Filippov <jcmvbkbc@...il.com>,
        Abaci Robot <abaci@...ux.alibaba.com>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Subject: [PATCH] xtensa: ISS: don't use string pointer before NULL check

Move strlen call inside the if block that checks string pointer for NULL.
While at it also fix the following coccicheck warning:

./arch/xtensa/platforms/iss/console.c:204:10-11: WARNING comparing
pointer to 0.

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
 arch/xtensa/platforms/iss/console.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/xtensa/platforms/iss/console.c b/arch/xtensa/platforms/iss/console.c
index a3dda25a4e45..8f41c0088220 100644
--- a/arch/xtensa/platforms/iss/console.c
+++ b/arch/xtensa/platforms/iss/console.c
@@ -193,10 +193,10 @@ late_initcall(rs_init);
 
 static void iss_console_write(struct console *co, const char *s, unsigned count)
 {
-	int len = strlen(s);
-
-	if (s != 0 && *s != 0)
+	if (s && *s != 0) {
+		int len = strlen(s);
 		simc_write(1, s, count < len ? count : len);
+	}
 }
 
 static struct tty_driver* iss_console_device(struct console *c, int *index)
-- 
2.20.1