netdev - Re: [PATCH net-next 01/10] mptcp: add TCP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20211206171405.13e9f9ee@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 6 Dec 2021 17:14:05 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Mat Martineau <mathew.j.martineau@...ux.intel.com>
Cc:     netdev@...r.kernel.org, Florian Westphal <fw@...len.de>,
        davem@...emloft.net, matthieu.baerts@...sares.net,
        mptcp@...ts.linux.dev
Subject: Re: [PATCH net-next 01/10] mptcp: add TCP_INQ cmsg support

On Fri,  3 Dec 2021 14:35:32 -0800 Mat Martineau wrote:
> +static int mptcp_put_int_option(struct mptcp_sock *msk, char __user *optval,
> +				int __user *optlen, int val)
> +{
> +	int len;
> +
> +	if (get_user(len, optlen))
> +		return -EFAULT;
> +
> +	len = min_t(unsigned int, len, sizeof(int));
> +	if (len < 0)
> +		return -EINVAL;

TCP has the same statement but surely it's dead code?

min_t(unsigned, .., 4)

cannot return anything outside of the range from 0 to 4.

> +	if (put_user(len, optlen))
> +		return -EFAULT;
> +	if (copy_to_user(optval, &val, len))
> +		return -EFAULT;
> +
> +	return 0;