netdev - Re: [PATCH RESEND] net: ath9k: fix use-after-free in ath9k_hif_usb_rx

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Date:   Sat, 2 Oct 2021 16:05:47 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     ath9k-devel@....qualcomm.com, kvalo@...eaurora.org,
        davem@...emloft.net, kuba@...nel.org, Sujith.Manoharan@...eros.com,
        linville@...driver.com, vasanth@...eros.com,
        senthilkumar@...eros.com
Cc:     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 RESEND] net: ath9k: fix use-after-free in
 ath9k_hif_usb_rx_cb

On 9/22/21 19:42, 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.
> 
> 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>
> ---
> 
> Why resend?
> 	No activity on this patch since 8/6/21, Kalle Valo has asked around,
> 	for review and no one claimed it.
> 
> Resend changes:
> 	1. Rebased on top of v5.15-rc2
> 	2. Removed clean ups for macros
> 	3. Added 1 more syzbot tag, since this patch has passed 2 syzbot
> 	tests
> 

Hi, ath9k maintainers!

Does this patch need any further work? I can't see any comments on it 
since 8/6/21 and I can't see it on wireless patchwork.

If this bug is already fixed and I've overlooked a fix commit, please, 
let me know. As I see syzbot hits this bug really often [1]

Thanks


[1] 
https://syzkaller.appspot.com/bug?id=6ead44e37afb6866ac0c7dd121b4ce07cb665f60




With regards,
Pavel Skripkin