linux-kernel - Re: [PATCH v2 -next] tty: ipwireless: Fix potential NULL pointer dereference

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Date:   Wed, 30 Jan 2019 16:58:30 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     YueHaibing <yuehaibing@...wei.com>, gregkh@...uxfoundation.org,
        David Sterba <DSterba@...e.com>
Cc:     jikos@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 -next] tty: ipwireless: Fix potential NULL pointer
 dereference

On 30. 01. 19, 11:30, YueHaibing wrote:
> There is a potential NULL pointer dereference in case
> alloc_ctrl_packet() fails and returns NULL.
> 
> Fixes: 099dc4fb6265 ("ipwireless: driver for PC Card 3G/UMTS modem")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
> v2: fix return value
> ---
>  drivers/tty/ipwireless/hardware.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/tty/ipwireless/hardware.c b/drivers/tty/ipwireless/hardware.c
> index b0baa4c..1e21ae3 100644
> --- a/drivers/tty/ipwireless/hardware.c
> +++ b/drivers/tty/ipwireless/hardware.c
> @@ -1516,6 +1516,8 @@ static void ipw_send_setup_packet(struct ipw_hardware *hw)
>  			sizeof(struct ipw_setup_get_version_query_packet),
>  			ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
>  			TL_SETUP_SIGNO_GET_VERSION_QRY);
> +	if (!ver_packet)
> +		return;

LGTM, the timer will retry 30 times, ticking every second.

Acked-by: Jiri Slaby <jslaby@...e.cz>

-- 
js
suse labs