linux-kernel - Re: [PATCH] net: ath9k: fix use-after-free in ath9k_hif_usb_rx

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Date:   Fri, 13 Aug 2021 18:01:31 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     ath9k-devel@....qualcomm.com, kvalo@...eaurora.org,
        davem@...emloft.net, vasanth@...eros.com, senthilkumar@...eros.com
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        syzbot+03110230a11411024147@...kaller.appspotmail.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ath9k: fix use-after-free in ath9k_hif_usb_rx_cb

On 8/4/21 10:48 PM, Pavel Skripkin wrote:
> Syzbot reported use-after-free Read in ath9k_hif_usb_rx_cb(). 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 save.
> 
> Also, I made whitespaces clean ups in *_STAT_* macros definitions
> to make checkpatch.pl happy.
> 
> Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.")
> Reported-and-tested-by: syzbot+03110230a11411024147@...kaller.appspotmail.com
> Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
> ---
> 
> Hi, ath9k maintainer/developers!
> 
> I know, that you do not like changes, that wasn't tested on real
> hardware. I really don't access to this one, so I'd like you to test it on
> real hardware piece, if you have one. At least, this patch was tested by
> syzbot [1]
> 
> [1] https://syzkaller.appspot.com/bug?id=6ead44e37afb6866ac0c7dd121b4ce07cb665f60
> 
> ---

Btw, this patch also passes this syzbot test

https://syzkaller.appspot.com/bug?id=b8101ffcec107c0567a0cd8acbbacec91e9ee8de


With regards,
Pavel Skripkin