linux-kernel - Re: [PATCH v3] staging: rtlwifi: rtl8822b: fix to avoid NULL pointer dereference

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Date:   Thu, 21 Mar 2019 01:58:49 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Aditya Pakki <pakki001@....edu>
Cc:     kjlu@....edu, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sabin Mihai Rapan <sabin.rapan@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] staging: rtlwifi: rtl8822b: fix to avoid NULL pointer
 dereference


On 3/20/2019 10:32 PM, Aditya Pakki wrote:
> skb allocated via dev_alloc_skb can fail and return a NULL pointer.
> This patch avoids such a scenario and returns, consistent with other
> invocations.
>
> Signed-off-by: Aditya Pakki <pakki001@....edu>
>
> ---
> v2: Move signed off above the version change log
> v1: Patch collision with rtl_phydm.c, fix as per Greg
> ---
>   drivers/staging/rtlwifi/rtl8822be/fw.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/staging/rtlwifi/rtl8822be/fw.c b/drivers/staging/rtlwifi/rtl8822be/fw.c
> index f061dd1382aa..cf6b7a80b753 100644
> --- a/drivers/staging/rtlwifi/rtl8822be/fw.c
> +++ b/drivers/staging/rtlwifi/rtl8822be/fw.c
> @@ -743,6 +743,8 @@ void rtl8822be_set_fw_rsvdpagepkt(struct ieee80211_hw *hw, bool b_dl_finished)
>   		      u1_rsvd_page_loc, 3);
>   
>   	skb = dev_alloc_skb(totalpacketlen);
> +	if (!skb)
> +		return;
>   	memcpy((u8 *)skb_put(skb, totalpacketlen), &reserved_page_packet,
>   	       totalpacketlen);
>   


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