linux-kernel - Re: [PATCH net-next] tcp: fix incorrect parameter validation in the do_tcp

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Date: Wed, 6 Mar 2024 11:54:40 +0000
From: Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>
To: Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
CC: "David S. Miller" <davem@...emloft.net>, David Ahern <dsahern@...nel.org>,
	Jakub Kicinski <kuba@...nel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "lvc-project@...uxtesting.org"
	<lvc-project@...uxtesting.org>
Subject: Re: [PATCH net-next] tcp: fix incorrect parameter validation in the
 do_tcp_getsockopt() function

On 3/6/24 14:36, Paolo Abeni wrote:
> The above is incorrect, as the 'len' variable is a signed integer

I mean, if 'len' is negative then after this expression
len = min_t(unsigned int, len, sizeof(int));
the 'len' variable will be equal to sizeof(int) == 4
and the statement
if (len < 0) return -EINVAL;
might be unreachable during program execution.