linux-kernel - Re: [PATCH] net: rtl8192c: fix a potential NULL pointer dereference

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Date:   Tue, 12 Mar 2019 09:03:41 +0000
From:   Pkshih <pkshih@...ltek.com>
To:     "kjlu@....edu" <kjlu@....edu>
CC:     "mingo@...nel.org" <mingo@...nel.org>,
        "Larry.Finger@...inger.net" <Larry.Finger@...inger.net>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "pakki001@....edu" <pakki001@....edu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "kvalo@...eaurora.org" <kvalo@...eaurora.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
Subject: Re: [PATCH] net: rtl8192c: fix a potential NULL pointer dereference

On Tue, 2019-03-12 at 02:59 -0500, Kangjie Lu wrote:
> In case dev_alloc_skb fails, the fix safely returns to avoid
> potential NULL pointer dereference.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>  drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c
> b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c
> index 18c76990a089..9042fc044c7e 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c
> @@ -623,6 +623,9 @@ void rtl92c_set_fw_rsvdpagepkt(struct ieee80211_hw *hw,
>  		      u1rsvdpageloc, 3);
>  
>  	skb = dev_alloc_skb(totalpacketlen);
> +	if (!skb)
> +		return;
> +
>  	skb_put_data(skb, &reserved_page_packet, totalpacketlen);
>  
>  	if (cmd_send_packet)

The subject prefix should be 'rtlwifi: ...'.

Your fix is ok, but I would like to fix all failed cases of dev_alloc_skb().
I will send another patch to fix all of them.

Thanks
PK