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From: Pavel Skripkin <paskripkin@gmail.com>
To: ath9k-devel@qca.qualcomm.com, kvalo@codeaurora.org,
	davem@davemloft.net, vasanth@atheros.com,
	senthilkumar@atheros.com
Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	syzbot+03110230a11411024147@syzkaller.appspotmail.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: ath9k: fix use-after-free in ath9k_hif_usb_rx_cb
Date: Fri, 13 Aug 2021 18:01:31 +0300	[thread overview]
Message-ID: <9e14d6b7-50d0-db97-f6d9-3b84e188e8bd@gmail.com> (raw)
In-Reply-To: <20210804194841.14544-1-paskripkin@gmail.com>

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@syzkaller.appspotmail.com
> Signed-off-by: Pavel Skripkin <paskripkin@gmail.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

      parent reply	other threads:[~2021-08-13 15:01 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210804194841.14544-1-paskripkin@gmail.com>
2021-08-04 19:57 ` Pavel Skripkin
2021-08-31 10:43   ` Pavel Skripkin
2021-09-19 17:28     ` Pavel Skripkin
2021-09-22 16:42       ` [PATCH RESEND] " Pavel Skripkin
2021-10-02 13:05         ` Pavel Skripkin
2021-10-02 13:11           ` Kalle Valo
2021-10-02 13:14             ` Pavel Skripkin
2021-08-13 15:01 ` Pavel Skripkin [this message]

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