netdev - Re: [PATCH net 4/9] mlxsw: spectrum_acl_tcam: Fix possible use-after-free during rehash

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Date: Wed, 24 Apr 2024 15:50:02 +0100
From: Simon Horman <horms@...nel.org>
To: Petr Machata <petrm@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, Ido Schimmel <idosch@...dia.com>,
	Jiri Pirko <jiri@...nulli.us>, Alexander Zubkov <green@...tor.net>,
	mlxsw@...dia.com
Subject: Re: [PATCH net 4/9] mlxsw: spectrum_acl_tcam: Fix possible
 use-after-free during rehash

On Mon, Apr 22, 2024 at 05:25:57PM +0200, Petr Machata wrote:
> From: Ido Schimmel <idosch@...dia.com>
> 
> The rehash delayed work migrates filters from one region to another
> according to the number of available credits.
> 
> The migrated from region is destroyed at the end of the work if the
> number of credits is non-negative as the assumption is that this is
> indicative of migration being complete. This assumption is incorrect as
> a non-negative number of credits can also be the result of a failed
> migration.
> 
> The destruction of a region that still has filters referencing it can
> result in a use-after-free [1].
> 
> Fix by not destroying the region if migration failed.
> 
> [1]
> BUG: KASAN: slab-use-after-free in mlxsw_sp_acl_ctcam_region_entry_remove+0x21d/0x230

...

> Fixes: c9c9af91f1d9 ("mlxsw: spectrum_acl: Allow to interrupt/continue rehash work")
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> Tested-by: Alexander Zubkov <green@...tor.net>
> Reviewed-by: Petr Machata <petrm@...dia.com>
> Signed-off-by: Petr Machata <petrm@...dia.com>

Reviewed-by: Simon Horman <horms@...nel.org>

...