linux-kernel - Re: [PATCH v2] clk: zynq: Prevent null pointer dereference caused by kmalloc failure

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Message-ID: <6bfce5ec26a26c327c4196dbe57b63d5.sboyd@kernel.org>
Date: Thu, 29 Feb 2024 17:21:46 -0800
From: Stephen Boyd <sboyd@...nel.org>
To: Duoming Zhou <duoming@....edu.cn>, Michal Simek <michal.simek@....com>, linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org, mturquette@...libre.com
Subject: Re: [PATCH v2] clk: zynq: Prevent null pointer dereference caused by kmalloc failure

Quoting Michal Simek (2024-02-29 04:45:54)
> On 2/29/24 13:22, Duoming Zhou wrote:
> > diff --git a/drivers/clk/zynq/clkc.c b/drivers/clk/zynq/clkc.c
> > index 7bdeaff2bfd..e4c4c9adf79 100644
> > --- a/drivers/clk/zynq/clkc.c
> > +++ b/drivers/clk/zynq/clkc.c
> > @@ -427,7 +427,7 @@ static void __init zynq_clk_setup(struct device_node *np)
> >                       SLCR_GEM1_CLK_CTRL, 0, 0, &gem1clk_lock);
> >   
> >       tmp = strlen("mio_clk_00x");
> > -     clk_name = kmalloc(tmp, GFP_KERNEL);
> > +     char clk_name[tmp];
> 
> I know that Stephen asked for it but variable with variable length in the middle 
> of code doesn't look good or useful.

I didn't ask for it to be in the middle of the function :)