linux-kernel - [PATCH v3] MIPS: BCM63xx: Add check for NULL for clk in clk

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Message-Id: <20221209100550.30470-1-abelova@astralinux.ru>
Date:   Fri,  9 Dec 2022 13:05:50 +0300
From:   Anastasia Belova <abelova@...ralinux.ru>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Anastasia Belova <abelova@...ralinux.ru>,
        Randy Dunlap <rdunlap@...radead.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Maxime Bizon <mbizon@...ebox.fr>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: [PATCH v3] MIPS: BCM63xx: Add check for NULL for clk in clk_enable

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: e7300d04bd08 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
Signed-off-by: Anastasia Belova <abelova@...ralinux.ru>
---
v2: Fix errors reported by kernel test robot <lkp@...el.com>.
v3: Merge several patches into single one.
 arch/mips/bcm63xx/clk.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/mips/bcm63xx/clk.c b/arch/mips/bcm63xx/clk.c
index 6e6756e8fa0a..86a6e2590866 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);
-- 
2.30.2