linux-kernel - Re: [PATCH] isdn: hisax: l3dss1.c: Fix for possible null pointer dereference

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Date:	Tue, 20 May 2014 01:24:28 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Karsten Keil <isdn@...ux-pingi.de>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] isdn: hisax: l3dss1.c:  Fix for possible null pointer
 dereference

Hello.

On 05/17/2014 09:18 PM, Rickard Strandqvist wrote:

> There is otherwise a risk of a possible null pointer dereference.

> Was largely found by using a static code analysis program called cppcheck.

> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> ---
>   drivers/isdn/hisax/l3dss1.c |    8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)

> diff --git a/drivers/isdn/hisax/l3dss1.c b/drivers/isdn/hisax/l3dss1.c
> index cda7006..3ea6257 100644
> --- a/drivers/isdn/hisax/l3dss1.c
> +++ b/drivers/isdn/hisax/l3dss1.c
> @@ -2208,8 +2208,12 @@ static int l3dss1_cmd_global(struct PStack *st, isdn_ctrl *ic)
>   				{ free_invoke_id(st, id);
>   					return (-2);
>   				}
> -			pc->prot.dss1.ll_id = ic->parm.dss1_io.ll_id; /* remember id */
> -			pc->prot.dss1.proc = ic->parm.dss1_io.proc; /* and procedure */
> +
> +			if (pc)
> +			{

    { sould be on the same line as *if*.

> +				pc->prot.dss1.ll_id = ic->parm.dss1_io.ll_id; /* remember id */
> +				pc->prot.dss1.proc = ic->parm.dss1_io.proc; /* and procedure */
> +			}

WBR, Sergei

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