On Mon, Jan 13, 2025 at 10:00:18AM +0100, Johan Hovold wrote:
> On Sun, Jan 12, 2025 at 09:55:58AM +0000, Qasim Ijaz wrote:
> > This patch addresses a null-ptr-deref in qt2_process_read_urb() due to
> > an incorrect bounds check in the following:
>
> Thanks for the fix. This looks correct, but your patch is whitespace
> damaged (tabs replaced with spaces) and does not apply.
>
> Can you please fix your mail setup and resend a v3? (Make sure to send
> it to yourself first.)
>
> When doing so, please use the common patch prefix for this driver:
>
> USB: serial: quatech2:
>
> > ""
>
> You can drop these (markup?) quotes.
>
> > if (newport > serial->num_ports) {
> > dev_err(&port->dev,
> > "%s - port change to invalid port: %i\n",
> > __func__, newport);
> > break;
> > }
> > ""
> >
> > The condition doesn't account for the valid range of the serial->port
> > buffer, which is from 0 to serial->num_ports - 1. When newport is equal
> > to serial->num_ports, the assignment of "port" in the
> > following code is out-of-bounds and NULL:
> >
> > ""
> > serial_priv->current_port = newport;
> > port = serial->port[serial_priv->current_port];
> >
> > ""
> >
> > The fix checks if newport is greater than or equal to serial->num_ports
> > indicating it is out-of-bounds.
> >
> > Reported-by: syzbot <syzbot+506479ebf12fe435d01a@xxxxxxxxxxxxxxxxxxxxxxxxx>
> > Closes: https://syzkaller.appspot.com/bug?extid=506479ebf12fe435d01a
> > Signed-off-by: Qasim Ijaz <qasdev00@xxxxxxxxx>
>
> And please include a Fixes and CC stable tag:
>
> Fixes: f7a33e608d9a ("USB: serial: add quatech2 usb to serial driver")
> Cc: stable@xxxxxxxxxxxxxxx # 3.5
>
> Johan
Hi Johan,
Thank you for your feedback on the previous version. I've sent the v3 patch addressing the issues: fixed whitespace damage, removed quotes, updated the prefix, and added Fixes and Cc tags.
Best regards,
Qasim
