linux-kernel - Re: [PATCH] scsi: libfc: fix null pointer dereference on a null lport

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Message-ID: <14c9e345-dd98-63e7-5ba2-679f10760fe6@suse.de>
Date:   Fri, 12 Jul 2019 08:34:33 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Colin King <colin.king@...onical.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: libfc: fix null pointer dereference on a null lport

On 7/2/19 11:18 AM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently if lport is null then the null lport pointer is dereference
> when printing out debug via the FC_LPORT_DB macro. Fix this by using
> the more generic FC_LIBFC_DBG debug macro instead that does not use
> lport.
> 
> Addresses-Coverity: ("Dereference after null check")
> Fixes: 7414705ea4ae ("libfc: Add runtime debugging with debug_logging module parameter")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/scsi/libfc/fc_exch.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
> index 025cd2ff9f65..c477fadbf504 100644
> --- a/drivers/scsi/libfc/fc_exch.c
> +++ b/drivers/scsi/libfc/fc_exch.c
> @@ -2591,8 +2591,8 @@ void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp)
>  
>  	/* lport lock ? */
>  	if (!lport || lport->state == LPORT_ST_DISABLED) {
> -		FC_LPORT_DBG(lport, "Receiving frames for an lport that "
> -			     "has not been initialized correctly\n");
> +		FC_LIBFC_DBG("Receiving frames for an lport that "
> +			     "has not been initialized correctly\n");
>  		fc_frame_free(fp);
>  		return;
>  	}
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
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