linux-kernel - Re: [PATCH] i2c: busses/i2c-pxa.c: fix potential null pointer dereference error

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Message-ID: <CAH9JG2XSpFJeUvv7cw-JWadmi=X0-4EsN5FFKuDkwo=-mmzHSQ@mail.gmail.com>
Date:	Tue, 5 Feb 2013 08:47:10 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Cong Ding <dinggnu@...il.com>
Cc:	Wolfram Sang <w.sang@...gutronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Karol Lewandowski <k.lewandowsk@...sung.com>,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: busses/i2c-pxa.c: fix potential null pointer
 dereference error

Hi,

On Tue, Feb 5, 2013 at 7:11 AM, Cong Ding <dinggnu@...il.com> wrote:
> If it goes to eclk through line 1107, the variable res would be NULL. It will
> cause a null pointer dereference error if we call release_mem_region.
>
> Signed-off-by: Cong Ding <dinggnu@...il.com>
> ---
>  drivers/i2c/busses/i2c-pxa.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
> index 1034d93..eadf1a4 100644
> --- a/drivers/i2c/busses/i2c-pxa.c
> +++ b/drivers/i2c/busses/i2c-pxa.c
> @@ -1211,7 +1211,8 @@ eremap:
>  eclk:
>         kfree(i2c);
>  emalloc:
> -       release_mem_region(res->start, resource_size(res));
> +       if (!res)
if (res)?
It's not match with description. and it seems wrong.

Thank you,
Kyungmin Park
> +               release_mem_region(res->start, resource_size(res));
>         return ret;
>  }
>
> --
> 1.7.9.5
>
> --
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