linux-kernel - Re: [PATCH] staging: rtlwifi: Fix potential NULL pointer dereference

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Date:   Wed, 20 Mar 2019 20:36:54 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Aditya Pakki <pakki001@....edu>
Cc:     kjlu@....edu, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtlwifi: Fix potential NULL pointer dereference


On 3/13/2019 9:43 PM, Aditya Pakki wrote:
> phydm.internal is allocated using kzalloc which is used multiple
> times without a check for NULL pointer. This patch avoids such a
> scenario.
>
> Signed-off-by: Aditya Pakki<pakki001@....edu>
> ---
>   drivers/staging/rtlwifi/phydm/rtl_phydm.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/staging/rtlwifi/phydm/rtl_phydm.c b/drivers/staging/rtlwifi/phydm/rtl_phydm.c
> index 9930ed954abb..37c7fcb72b65 100644
> --- a/drivers/staging/rtlwifi/phydm/rtl_phydm.c
> +++ b/drivers/staging/rtlwifi/phydm/rtl_phydm.c
> @@ -181,6 +181,9 @@ static int rtl_phydm_init_priv(struct rtl_priv *rtlpriv,
>   	rtlpriv->phydm.internal =
>   		kzalloc(sizeof(struct phy_dm_struct), GFP_KERNEL);
>   
> +	if (!rtlpriv->phydm.internal)
> +		return -ENOMEM;
> +



Although, it is good to add a check but nobody is checking this 
functions returned value.

Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>

Can you fix that cleanly ? or i will do?

Cheers,
Mukesh


>   	_rtl_phydm_init_com_info(rtlpriv, ic, params);
>   
>   	odm_init_all_timers(dm);