linux-kernel - Re: [PATCH v2] wifi: ath9k: avoid referencing uninit memory in ath9k_wmi_ctrl

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Message-ID: <168270076830.13772.17120871163314648894.kvalo@kernel.org>
Date:   Fri, 28 Apr 2023 16:52:50 +0000 (UTC)
From:   Kalle Valo <kvalo@...nel.org>
To:     Fedor Pchelkin <pchelkin@...ras.ru>
Cc:     Toke Høiland-Jørgensen <toke@...e.dk>,
        Fedor Pchelkin <pchelkin@...ras.ru>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Senthil Balasubramanian <senthilkumar@...eros.com>,
        "John W. Linville" <linville@...driver.com>,
        Vasanthakumar Thiagarajan <vasanth@...eros.com>,
        Sujith <Sujith.Manoharan@...eros.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        lvc-project@...uxtesting.org,
        syzbot+f2cb6e0ffdb961921e4d@...kaller.appspotmail.com
Subject: Re: [PATCH v2] wifi: ath9k: avoid referencing uninit memory in
 ath9k_wmi_ctrl_rx

Fedor Pchelkin <pchelkin@...ras.ru> wrote:

> For the reasons also described in commit b383e8abed41 ("wifi: ath9k: avoid
> uninit memory read in ath9k_htc_rx_msg()"), ath9k_htc_rx_msg() should
> validate pkt_len before accessing the SKB.
> 
> For example, the obtained SKB may have been badly constructed with
> pkt_len = 8. In this case, the SKB can only contain a valid htc_frame_hdr
> but after being processed in ath9k_htc_rx_msg() and passed to
> ath9k_wmi_ctrl_rx() endpoint RX handler, it is expected to have a WMI
> command header which should be located inside its data payload.
> 
> Implement sanity checking inside ath9k_wmi_ctrl_rx(). Otherwise, uninit
> memory can be referenced.
> 
> Tested on Qualcomm Atheros Communications AR9271 802.11n .
> 
> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
> 
> Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.")
> Reported-and-tested-by: syzbot+f2cb6e0ffdb961921e4d@...kaller.appspotmail.com
> Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
> Acked-by: Toke Høiland-Jørgensen <toke@...e.dk>
> Signed-off-by: Kalle Valo <quic_kvalo@...cinc.com>

Patch applied to ath-next branch of ath.git, thanks.

f24292e82708 wifi: ath9k: avoid referencing uninit memory in ath9k_wmi_ctrl_rx

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20230424183348.111355-1-pchelkin@ispras.ru/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches