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Subject: Re: [PATCH v3] wifi: ath9k: hif_usb: clean up skbs if
 ath9k_hif_usb_rx_stream() fails
From:   Kalle Valo <kvalo@kernel.org>
In-Reply-To: <20230104123615.51511-1-pchelkin@ispras.ru>
References: <20230104123615.51511-1-pchelkin@ispras.ru>
To:     Fedor Pchelkin <pchelkin@ispras.ru>
Cc:     =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= <toke@toke.dk>,
        Fedor Pchelkin <pchelkin@ispras.ru>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Zekun Shen <bruceshenzk@gmail.com>,
        Joe Perches <joe@perches.com>,
        "John W. Linville" <linville@tuxdriver.com>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Alexey Khoroshilov <khoroshilov@ispras.ru>,
        lvc-project@linuxtesting.org,
        syzbot+e9632e3eb038d93d6bc6@syzkaller.appspotmail.com
User-Agent: pwcli/0.1.1-git (https://github.com/kvalo/pwcli/) Python/3.7.3
Message-ID: <167395643773.22891.16285001709469402107.kvalo@kernel.org>
Date:   Tue, 17 Jan 2023 11:53:59 +0000 (UTC)
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Fedor Pchelkin <pchelkin@ispras.ru> wrote:

> Syzkaller detected a memory leak of skbs in ath9k_hif_usb_rx_stream().
> While processing skbs in ath9k_hif_usb_rx_stream(), the already allocated
> skbs in skb_pool are not freed if ath9k_hif_usb_rx_stream() fails. If we
> have an incorrect pkt_len or pkt_tag, the input skb is considered invalid
> and dropped. All the associated packets already in skb_pool should be
> dropped and freed. Added a comment describing this issue.
> 
> The patch also makes remain_skb NULL after being processed so that it
> cannot be referenced after potential free. The initialization of hif_dev
> fields which are associated with remain_skb (rx_remain_len,
> rx_transfer_len and rx_pad_len) is moved after a new remain_skb is
> allocated.
> 
> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
> 
> Fixes: 6ce708f54cc8 ("ath9k: Fix out-of-bound memcpy in ath9k_hif_usb_rx_stream")
> Fixes: 44b23b488d44 ("ath9k: hif_usb: Reduce indent 1 column")
> Reported-by: syzbot+e9632e3eb038d93d6bc6@syzkaller.appspotmail.com
> Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
> Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>

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

0af54343a762 wifi: ath9k: hif_usb: clean up skbs if ath9k_hif_usb_rx_stream() fails

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20230104123615.51511-1-pchelkin@ispras.ru/

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