From: Anastasia Belova <abelova@astralinux.ru>
Date: Fri, 9 Dec 2022 10:05:50 +0000 (+0300)
Subject: MIPS: BCM63xx: Add check for NULL for clk in clk_enable
X-Git-Tag: baikal/aarch64/sdk5.9~725
X-Git-Url: https://git.baikalelectronics.ru/?a=commitdiff_plain;h=e2ce5571b5ef263294a149fa6a0937a9bb30e3bb;p=kernel.git

MIPS: BCM63xx: Add check for NULL for clk in clk_enable

[ Upstream commit ee9ef11bd2a59c2fefaa0959e5efcdf040d7c654 ]

Check clk for NULL before calling clk_enable_unlocked where clk
is dereferenced. There is such check in other implementations
of clk_enable.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 6c22f5913d59 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
Signed-off-by: Anastasia Belova <abelova@astralinux.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/arch/mips/bcm63xx/clk.c b/arch/mips/bcm63xx/clk.c
index dcfa0ea912fe1..f183c45503ce1 100644
--- a/arch/mips/bcm63xx/clk.c
+++ b/arch/mips/bcm63xx/clk.c
@@ -361,6 +361,8 @@ static struct clk clk_periph = {
  */
 int clk_enable(struct clk *clk)
 {
+	if (!clk)
+		return 0;
 	mutex_lock(&clocks_mutex);
 	clk_enable_unlocked(clk);
 	mutex_unlock(&clocks_mutex);