linux-kernel - [PATCH] arm: Add clk_get_rate input parameter null check

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Date:   Fri,  6 Nov 2020 09:46:15 +0800
From:   Wang Qing <wangqing@...o.com>
To:     Hartley Sweeten <hsweeten@...ionengravers.com>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] arm: Add clk_get_rate input parameter null check

The input parameter of clk_get_rate() is checked with IS_ERR(),
so here we need to check null on clk.

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 arch/arm/mach-ep93xx/clock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
index 2810eb5..4313b2f
--- a/arch/arm/mach-ep93xx/clock.c
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -321,6 +321,9 @@ static unsigned long get_uart_rate(struct clk *clk)
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+	if (!clk)
+		return 0;
+
 	if (clk->get_rate)
 		return clk->get_rate(clk);
 
-- 
2.7.4