From: Kalle Valo <kvalo@codeaurora.org>
To: Zekun Shen <bruceshenzk@gmail.com>
Cc: bruceshenzk@gmail.com, Pontus Fuchs <pontus.fuchs@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ar5523: Fix null-ptr-deref with unexpected WDCMSG_TARGET_START reply
Date: Fri, 12 Nov 2021 07:54:06 +0000 (UTC) [thread overview]
Message-ID: <163670364142.27466.15677300491997142770.kvalo@codeaurora.org> (raw)
In-Reply-To: <YXsmPQ3awHFLuAj2@10-18-43-117.dynapool.wireless.nyu.edu>
Zekun Shen <bruceshenzk@gmail.com> wrote:
> Unexpected WDCMSG_TARGET_START replay can lead to null-ptr-deref
> when ar->tx_cmd->odata is NULL. The patch adds a null check to
> prevent such case.
>
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> ar5523_cmd+0x46a/0x581 [ar5523]
> ar5523_probe.cold+0x1b7/0x18da [ar5523]
> ? ar5523_cmd_rx_cb+0x7a0/0x7a0 [ar5523]
> ? __pm_runtime_set_status+0x54a/0x8f0
> ? _raw_spin_trylock_bh+0x120/0x120
> ? pm_runtime_barrier+0x220/0x220
> ? __pm_runtime_resume+0xb1/0xf0
> usb_probe_interface+0x25b/0x710
> really_probe+0x209/0x5d0
> driver_probe_device+0xc6/0x1b0
> device_driver_attach+0xe2/0x120
>
> I found the bug using a custome USBFuzz port. It's a research work
> to fuzz USB stack/drivers. I modified it to fuzz ath9k driver only,
> providing hand-crafted usb descriptors to QEMU.
>
> After fixing the code (fourth byte in usb packet) to WDCMSG_TARGET_START,
> I got the null-ptr-deref bug. I believe the bug is triggerable whenever
> cmd->odata is NULL. After patching, I tested with the same input and no
> longer see the KASAN report.
>
> This was NOT tested on a real device.
>
> Signed-off-by: Zekun Shen <bruceshenzk@gmail.com>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Patch applied to ath-next branch of ath.git, thanks.
ae80b6033834 ar5523: Fix null-ptr-deref with unexpected WDCMSG_TARGET_START reply
--
https://patchwork.kernel.org/project/linux-wireless/patch/YXsmPQ3awHFLuAj2@10-18-43-117.dynapool.wireless.nyu.edu/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
prev parent reply other threads:[~2021-11-12 7:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-28 22:37 [PATCH] ar5523: Fix null-ptr-deref with unexpected WDCMSG_TARGET_START reply Zekun Shen
2021-10-29 3:53 ` Kalle Valo
2021-10-29 13:53 ` [PATCH] ar5523: Fix null-ptr-deref with unexpected WDCMSG_TARGET_START reply^[ Zekun Shen
2021-11-10 14:56 ` Kalle Valo
2021-11-12 7:54 ` Kalle Valo [this message]
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=163670364142.27466.15677300491997142770.kvalo@codeaurora.org \
--to=kvalo@codeaurora.org \
--cc=bruceshenzk@gmail.com \
--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=pontus.fuchs@gmail.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.