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Date: Mon, 16 Feb 2026 16:52:38 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Raul Pazemecxas De Andrade <raul_pazemecxas@hotmail.com>
Cc: "sj@kernel.org" <sj@kernel.org>,
	"security@kernel.org" <security@kernel.org>,
	"damon@lists.linux.dev" <damon@lists.linux.dev>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] mm/damon/core: dangling walk_control pointer in
 damos_walk() on inactive context
Message-ID: <2026021646-sandbox-duchess-5b7b@gregkh>
References: <CPUPR80MB8171025468965E583EF2490F956CA@CPUPR80MB8171.lamprd80.prod.outlook.com>
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In-Reply-To: <CPUPR80MB8171025468965E583EF2490F956CA@CPUPR80MB8171.lamprd80.prod.outlook.com>

On Mon, Feb 16, 2026 at 03:34:44PM +0000, Raul Pazemecxas De Andrade wrote:
> Root cause
> ----------
> 
> Commit bf0eaba0ff9c ("mm/damon/core: implement damos_walk()")
> introduced this function without cleanup on the -EINVAL error path.
> 
> The sibling function damon_call() had the exact same bug and was
> fixed in f9132fbc2e83 by adding damon_call_handle_inactive_ctx()
> which removes the control object when the context is inactive.
> damos_walk() has no equivalent cleanup.

Can you submit a patch to resolve this to get credit for fixing the bug?

thanks,

greg k-h