linux-kernel - Re: [PATCH] mm: zswap: fix objcg use-after-free in entry destruction

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Message-ID: <ZbhUhSLyNcTK0_gd@google.com>
Date: Tue, 30 Jan 2024 01:44:37 +0000
From: Yosry Ahmed <yosryahmed@...gle.com>
To: Johannes Weiner <hannes@...xchg.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Nhat Pham <nphamcs@...il.com>, 
	Chengming Zhou <zhouchengming@...edance.com>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: zswap: fix objcg use-after-free in entry destruction

On Mon, Jan 29, 2024 at 08:34:38PM -0500, Johannes Weiner wrote:
> In the per-memcg LRU universe, LRU removal uses entry->objcg to
> determine which list count needs to be decreased. Drop the objcg
> reference after updating the LRU, to fix a possible use-after-free.
> 
> Fixes: a65b0e7607cc ("zswap: make shrinking memcg-aware")

Lots of hotfixes for zswap in v6.8 these couple of days :)

> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Yosry Ahmed <yosryahmed@...gle.com>

Thanks!