From c1fb1bf64bb63a1d6ae3311a9a3581a527c1f185 Mon Sep 17 00:00:00 2001 From: Defang Bo Date: Mon, 28 Dec 2020 10:07:45 +0800 Subject: 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 Signed-off-by: Greg Ungerer --- arch/m68k/coldfire/clk.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/m68k/coldfire') diff --git a/arch/m68k/coldfire/clk.c b/arch/m68k/coldfire/clk.c index 7bc666e482eb..076a9caa9557 100644 --- a/arch/m68k/coldfire/clk.c +++ b/arch/m68k/coldfire/clk.c @@ -90,6 +90,10 @@ 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); -- cgit v1.2.3