netdev - Re: [PATCH net 1/9] mlxsw: spectrum_acl_tcam: Fix race in region ID allocation

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Message-ID: <20240424144755.GC42092@kernel.org>
Date: Wed, 24 Apr 2024 15:47:55 +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, Amit Cohen <amcohen@...dia.com>
Subject: Re: [PATCH net 1/9] mlxsw: spectrum_acl_tcam: Fix race in region ID
 allocation

On Mon, Apr 22, 2024 at 05:25:54PM +0200, Petr Machata wrote:
> From: Ido Schimmel <idosch@...dia.com>
> 
> Region identifiers can be allocated both when user space tries to insert
> a new tc filter and when filters are migrated from one region to another
> as part of the rehash delayed work.
> 
> There is no lock protecting the bitmap from which these identifiers are
> allocated from, which is racy and leads to bad parameter errors from the
> device's firmware.
> 
> Fix by converting the bitmap to IDA which handles its own locking. For
> consistency, do the same for the group identifiers that are part of the
> same structure.
> 
> Fixes: 2bffc5322fd8 ("mlxsw: spectrum_acl: Don't take mutex in mlxsw_sp_acl_tcam_vregion_rehash_work()")
> Reported-by: Amit Cohen <amcohen@...dia.com>
> 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>