linux-kernel - Re: [PATCH v5 1/2] ath9k: fix use-after-free in ath9k_hif_usb_rx

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Message-ID: <87bkv0vg2p.wl-tiwai@suse.de>
Date:   Fri, 10 Jun 2022 14:49:34 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     toke@...e.dk
Cc:     Pavel Skripkin <paskripkin@...il.com>, kvalo@...nel.org,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        senthilkumar@...eros.com, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzbot+03110230a11411024147@...kaller.appspotmail.com,
        syzbot+c6dde1f690b60e0b9fbe@...kaller.appspotmail.com
Subject: Re: [PATCH v5 1/2] ath9k: fix use-after-free in ath9k_hif_usb_rx_cb

On Sat, 21 May 2022 23:28:01 +0200,
Pavel Skripkin wrote:
> 
> Syzbot reported use-after-free Read in ath9k_hif_usb_rx_cb() [0]. The
> problem was in incorrect htc_handle->drv_priv initialization.
> 
> Probable call trace which can trigger use-after-free:
> 
> ath9k_htc_probe_device()
>   /* htc_handle->drv_priv = priv; */
>   ath9k_htc_wait_for_target()      <--- Failed
>   ieee80211_free_hw()		   <--- priv pointer is freed
> 
> <IRQ>
> ...
> ath9k_hif_usb_rx_cb()
>   ath9k_hif_usb_rx_stream()
>    RX_STAT_INC()		<--- htc_handle->drv_priv access
> 
> In order to not add fancy protection for drv_priv we can move
> htc_handle->drv_priv initialization at the end of the
> ath9k_htc_probe_device() and add helper macro to make
> all *_STAT_* macros NULL safe, since syzbot has reported related NULL
> deref in that macros [1]
> 
> Link: https://syzkaller.appspot.com/bug?id=6ead44e37afb6866ac0c7dd121b4ce07cb665f60 [0]
> Link: https://syzkaller.appspot.com/bug?id=b8101ffcec107c0567a0cd8acbbacec91e9ee8de [1]
> Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.")
> Reported-and-tested-by: syzbot+03110230a11411024147@...kaller.appspotmail.com
> Reported-and-tested-by: syzbot+c6dde1f690b60e0b9fbe@...kaller.appspotmail.com
> Signed-off-by: Pavel Skripkin <paskripkin@...il.com>

Hi Toke, any update on this?

I'm asking it because this is a fix for a security issue
(CVE-2022-1679 [*]), and distros have been waiting for the fix getting
merged to the upstream for weeks.

[*] https://nvd.nist.gov/vuln/detail/CVE-2022-1679


thanks,

Takashi