netdev - Re: [PATCH][next] mlxsw: Use size_mul() in call to struct

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Message-ID: <ZQf8y6RVobiGUyzZ@shredder>
Date: Mon, 18 Sep 2023 10:31:23 +0300
From: Ido Schimmel <idosch@...sch.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] mlxsw: Use size_mul() in call to struct_size()

On Fri, Sep 15, 2023 at 01:01:23PM -0600, Gustavo A. R. Silva wrote:
> If, for any reason, the open-coded arithmetic causes a wraparound, the
> protection that `struct_size()` adds against potential integer overflows
> is defeated. Fix this by hardening call to `struct_size()` with `size_mul()`.
> 
> Fixes: 2285ec872d9d ("mlxsw: spectrum_acl_bloom_filter: use struct_size() in kzalloc()")
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Reviewed-by: Ido Schimmel <idosch@...dia.com>