linux-kernel - Re: [PATCH v2] ath9k: hif_usb: Fix use-after-free in ath9k_hif_usb_reg_in

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Date:   Sun, 09 Oct 2022 00:36:05 +0200
From:   Toke Høiland-Jørgensen <toke@...e.dk>
To:     Fedor Pchelkin <pchelkin@...ras.ru>, Kalle Valo <kvalo@...nel.org>
Cc:     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>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH v2] ath9k: hif_usb: Fix use-after-free in
 ath9k_hif_usb_reg_in_cb()

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

> It is possible that skb is freed in ath9k_htc_rx_msg(), then
> usb_submit_urb() fails and we try to free skb again. It causes
> use-after-free bug. Moreover, if alloc_skb() fails, urb->context becomes
> NULL but rx_buf is not freed and there can be a memory leak.
>
> The patch removes unnecessary nskb and makes skb processing more clear: it
> is supposed that ath9k_htc_rx_msg() either frees old skb or passes its
> managing to another callback function.
>
> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
>
> Fixes: 3deff76095c4 ("ath9k_htc: Increase URB count for REG_IN pipe")
> Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>

Acked-by: Toke Høiland-Jørgensen <toke@...e.dk>