linux-kernel - Re: [PATCH] media: vpss: fix a potential NULL pointer dereference

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Message-ID: <CA+V-a8tQMOjoWeBr==KW_7waQHMqG7x4FCVqMkVr3Hjy9cZe5A@mail.gmail.com>
Date:   Tue, 26 Mar 2019 09:46:16 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: vpss: fix a potential NULL pointer dereference

Hi Kangjie,

Thanks for the patch.

On Sat, Mar 23, 2019 at 2:51 AM Kangjie Lu <kjlu@....edu> wrote:
>
> In case ioremap fails, the fix returns -ENOMEM to avoid NULL
> pointer dereference.
>
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>  drivers/media/platform/davinci/vpss.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
Acked-by: Lad, Prabhakar <prabhakar.csengg@...il.com>

Cheers,
--Prabhakar Lad

> diff --git a/drivers/media/platform/davinci/vpss.c b/drivers/media/platform/davinci/vpss.c
> index 19cf6853411e..89a86c19579b 100644
> --- a/drivers/media/platform/davinci/vpss.c
> +++ b/drivers/media/platform/davinci/vpss.c
> @@ -518,6 +518,11 @@ static int __init vpss_init(void)
>                 return -EBUSY;
>
>         oper_cfg.vpss_regs_base2 = ioremap(VPSS_CLK_CTRL, 4);
> +       if (unlikely(!oper_cfg.vpss_regs_base2)) {
> +               release_mem_region(VPSS_CLK_CTRL, 4);
> +               return -ENOMEM;
> +       }
> +
>         writel(VPSS_CLK_CTRL_VENCCLKEN |
>                      VPSS_CLK_CTRL_DACCLKEN, oper_cfg.vpss_regs_base2);
>
> --
> 2.17.1
>