linux-kernel - Re: [PATCH] um: Add winch to winch_handlers before registering winch IRQ

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Date: Tue, 23 Apr 2024 09:22:31 +0200
From: Roberto Sassu <roberto.sassu@...weicloud.com>
To: Johannes Berg <johannes@...solutions.net>, richard@....at, 
	anton.ivanov@...bridgegreys.com
Cc: linux-kernel@...r.kernel.org, linux-um@...ts.infradead.org, Roberto
 Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH] um: Add winch to winch_handlers before registering
 winch IRQ

On Thu, 2024-03-28 at 09:25 +0100, Johannes Berg wrote:
> On Thu, 2024-03-07 at 11:49 +0100, Roberto Sassu wrote:
> > From: Roberto Sassu <roberto.sassu@...wei.com>
> > 
> > Registering a winch IRQ is racy, an interrupt may occur before the winch is
> > added to the winch_handlers list.
> > 
> > If that happens, register_winch_irq() adds to that list a winch that is
> > scheduled to be (or has already been) freed, causing a panic later in
> > winch_cleanup().
> > 
> > Avoid the race by adding the winch to the winch_handlers list before
> > registering the IRQ, and rolling back if um_request_irq() fails.
> > 
> 
> Reviewed-by: Johannes Berg <johannes@...solutions.net>

Thank you! Richard, are you going to pick this up?

Thanks

Roberto