linux-kernel - Re: [PATCH] tty: ipwireless: Fix use-after-free in tasklet during device removal

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Message-ID: <20260209102117.GZ26902@suse.cz>
Date: Mon, 9 Feb 2026 11:21:17 +0100
From: David Sterba <dsterba@...e.cz>
To: Jiri Kosina <jikos@...nel.org>
Cc: Greg KH <gregkh@...uxfoundation.org>, duoming@....edu.cn,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	dsterba@...e.com, jirislaby@...nel.org, kuba@...nel.org,
	alexander.deucher@....com, akpm@...ux-foundation.org,
	pkshih@...ltek.com, tglx@...nel.org, mingo@...nel.org
Subject: Re: [PATCH] tty: ipwireless: Fix use-after-free in tasklet during
 device removal

On Sun, Feb 08, 2026 at 06:25:38PM +0100, Jiri Kosina wrote:
> On Sun, 8 Feb 2026, Greg KH wrote:
> 
> > > I don't have the real hardware. In order to reproduce the bug, I simulate 
> > > the IPWireless PCMCIA card in the qemu by allocating and configuring the 
> > > necessary resources(I/O ports, memory regions, interrupts and so on) to
> > > correspond with the hardware expected by the driver in the initialization 
> > > code of the virtual device.
> > 
> > I wonder if this device even is still around, given that pcmcia is all
> > but dead for a very long time.
> 
> I doubt that this device is still around anywhere where reasonably new 
> kernels (including LTS) would matter.
> 
> I don't think I've seen this device (which was back then donated to me by 
> T-Mobile CZ in order to get it supported in Linux, and I am not sure how 
> much global adoption it got afterwards) for, let's say, past 15 years :)
> 
> I think (let's see what David, ho took the maintainership over for me 
> afterwards, has to say) we'd better deprecate and drop the whole thing, 
> rather than trying to pretend that it's still actively being taken care 
> of.

https://lore.kernel.org/all/20230223172403.GW10580@suse.cz/ last time
the question of keeping the driver was asked (2023). Back then I was
able to find the cards on second hand market but now I can't on a local
market and there's exactly one hit on global eBay.

Local linux related or telco support forums seem to mention the driver
until 2011 (root.cz, abclinuxu.cz, t-mobile.cz). It does not prove
nobody is using it but I think the chances are quite low to justify
keeping the driver.  It is simple enough to be built as an external
module eventually, I can help with that in case somebody really needs
that.