linux-kernel - [PATCH] m68k: let clk_enable() return immediately if clk is NULL

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Message-Id: <1609121265-207018-1-git-send-email-bodefang@126.com>
Date:   Mon, 28 Dec 2020 10:07:45 +0800
From:   Defang Bo <bodefang@....com>
To:     gerg@...ux-m68k.org, geert@...ux-m68k.org
Cc:     linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
        Defang Bo <bodefang@....com>
Subject: [PATCH] m68k: let clk_enable() return immediately if clk is NULL

Similar to commit<742859adc721>("m68k: let clk_disable() return immediately if clk is NULL").
there should be a check for clk to prevent NULL pointer dereference.

Signed-off-by: Defang Bo <bodefang@....com>
---
 arch/m68k/coldfire/clk.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/m68k/coldfire/clk.c b/arch/m68k/coldfire/clk.c
index 7bc666e..6decd11 100644
--- a/arch/m68k/coldfire/clk.c
+++ b/arch/m68k/coldfire/clk.c
@@ -90,6 +90,9 @@ EXPORT_SYMBOL(clk_get);
 int clk_enable(struct clk *clk)
 {
 	unsigned long flags;
+	if (!clk)
+		return -EINVAL;
+
 	spin_lock_irqsave(&clk_lock, flags);
 	if ((clk->enabled++ == 0) && clk->clk_ops)
 		clk->clk_ops->enable(clk);
-- 
2.7.4