linux-kernel - Re: [PATCH v3] staging: rtlwifi: Fix potential NULL pointer dereference of kzalloc

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Date:   Thu, 21 Mar 2019 00:51:17 +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 v3] staging: rtlwifi: Fix potential NULL pointer
 dereference of kzalloc


On 3/20/2019 9:12 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 by returning 0, consistent with the failure case.
>
> Signed-off-by: Aditya Pakki <pakki001@....edu>
>
> ---
> v2: Move the signed off line above
> v1: Patch collision with different things, fix as per Greg
> ---
>   drivers/staging/rtlwifi/phydm/rtl_phydm.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/staging/rtlwifi/phydm/rtl_phydm.c b/drivers/staging/rtlwifi/phydm/rtl_phydm.c
> index 9930ed954abb..4cc77b2016e1 100644
> --- a/drivers/staging/rtlwifi/phydm/rtl_phydm.c
> +++ b/drivers/staging/rtlwifi/phydm/rtl_phydm.c
> @@ -180,6 +180,8 @@ 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 0;
>   
>   	_rtl_phydm_init_com_info(rtlpriv, ic, params);
>   



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

Thanks,
Mukesh