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Message-ID: <877cmvhbpd.fsf@nvidia.com>
Date: Sun, 05 Nov 2023 18:12:14 -0800
From: Rahul Rameshbabu <rrameshbabu@...dia.com>
To: Lizhi Xu <lizhi.xu@...driver.com>
Cc: <syzbot+8a78ecea7ac1a2ea26e5@...kaller.appspotmail.com>,
<davem@...emloft.net>, <linux-kernel@...r.kernel.org>,
<netdev@...r.kernel.org>, <reibax@...il.com>,
<richardcochran@...il.com>, <syzkaller-bugs@...glegroups.com>
Subject: Re: [PATCH] ptp: fix null ptr deref in ptp_ioctrl
On Mon, 06 Nov, 2023 09:19:26 +0800 Lizhi Xu <lizhi.xu@...driver.com> wrote:
<snip>
>
> It can be confirmed that after the execution of "read (3, 0x20000080, 90)",
> ptp_release() will be called to release the queue and set
> pccontext->private_clkdata = NULL at the same time, this is unreasonable and
> incorrect. The queue is not the memory requested in ptp_read() and should not
> be released in ptp_read().
>
> Signed-off-by: Lizhi Xu <lizhi.xu@...driver.com>
> ---
> drivers/ptp/ptp_chardev.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
> index 282cd7d24077..27c1ef493617 100644
> --- a/drivers/ptp/ptp_chardev.c
> +++ b/drivers/ptp/ptp_chardev.c
> @@ -585,7 +585,5 @@ ssize_t ptp_read(struct posix_clock_context *pccontext, uint rdflags,
> free_event:
> kfree(event);
> exit:
> - if (result < 0)
> - ptp_release(pccontext);
> return result;
> }
There is already an ongoing review for a patch submission that covers this.
https://lore.kernel.org/netdev/tencent_856E1C97CCE9E2ED66CC087B526CD42ED50A@qq.com/
--
Thanks,
Rahul Rameshbabu
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