From: Kalle Valo <kvalo@kernel.org>
To: "Toke Høiland-Jørgensen" <toke@toke.dk>
Cc: Pavel Skripkin <paskripkin@gmail.com>,
davem@davemloft.net, kuba@kernel.org,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
syzbot+03110230a11411024147@syzkaller.appspotmail.com,
syzbot+c6dde1f690b60e0b9fbe@syzkaller.appspotmail.com
Subject: Re: [PATCH v6 1/2] ath9k: fix use-after-free in ath9k_hif_usb_rx_cb
Date: Wed, 15 Jun 2022 10:10:10 +0300 [thread overview]
Message-ID: <87k09ipfl9.fsf@kernel.org> (raw)
In-Reply-To: <87o7yvzf33.fsf@toke.dk> ("Toke \=\?utf-8\?Q\?H\=C3\=B8iland-J\?\= \=\?utf-8\?Q\?\=C3\=B8rgensen\=22's\?\= message of "Tue, 14 Jun 2022 12:58:40 +0200")
Toke Høiland-Jørgensen <toke@toke.dk> writes:
> Pavel Skripkin <paskripkin@gmail.com> writes:
>
>> 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@syzkaller.appspotmail.com
>> Reported-and-tested-by: syzbot+c6dde1f690b60e0b9fbe@syzkaller.appspotmail.com
>> Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
>
> Alright, since we've heard no more objections and the status quo is
> definitely broken, let's get this merged and we can follow up with any
> other fixes as necessary...
>
> Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
I'm wondering should these go to -rc or -next? Has anyone actually
tested these with real hardware? (syzbot testing does not count) With
the past bad experience with syzbot fixes I'm leaning towards -next to
have more time to fix any regressions.
--
https://patchwork.kernel.org/project/linux-wireless/list/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
next prev parent reply other threads:[~2022-06-15 7:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-13 18:43 [PATCH v6 1/2] ath9k: fix use-after-free in ath9k_hif_usb_rx_cb Pavel Skripkin
2022-06-13 18:44 ` [PATCH v6 2/2] ath9k: htc: clean up statistics macros Pavel Skripkin
2022-06-14 10:58 ` Toke Høiland-Jørgensen
2022-06-14 10:58 ` [PATCH v6 1/2] ath9k: fix use-after-free in ath9k_hif_usb_rx_cb Toke Høiland-Jørgensen
2022-06-15 7:10 ` Kalle Valo [this message]
2022-06-15 9:05 ` Toke Høiland-Jørgensen
2022-06-15 9:16 ` Takashi Iwai
2022-06-20 8:53 ` Kalle Valo
2022-06-20 10:02 ` Kalle Valo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87k09ipfl9.fsf@kernel.org \
--to=kvalo@kernel.org \
--cc=davem@davemloft.net \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-wireless@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=paskripkin@gmail.com \
--cc=syzbot+03110230a11411024147@syzkaller.appspotmail.com \
--cc=syzbot+c6dde1f690b60e0b9fbe@syzkaller.appspotmail.com \
--cc=toke@toke.dk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).