Re: [PATCH] net: check passed optlen before reading

On Tue, Dec 28, 2021 at 6:54 PM Jakub Kicinski [off-list ref] wrote:

On Tue, 28 Dec 2021 16:02:29 -0500 Tamir Duberstein wrote:

quoted

Errant brace in the earlier version.

From 8586be4d72c6c583b1085d2239076987e1b7c43a Mon Sep 17 00:00:00 2001
From: Tamir Duberstein <redacted>
Date: Tue, 28 Dec 2021 15:09:11 -0500
Subject: [PATCH v2] net: check passed optlen before reading

Add a check that the user-provided option is at least as long as the
number of bytes we intend to read. Before this patch we would blindly
read sizeof(int) bytes even in cases where the user passed
optlen<sizeof(int), which would potentially read garbage or fault.

Discovered by new tests in https://github.com/google/gvisor/pull/6957 .

Signed-off-by: Tamir Duberstein <redacted>

Your patches are corrupted by your email client.

Can you try sending the latest version with git send-email?

Then perhaps also update the subject line to make it more clear where
this applies: "ipv6: raw: check passed optlen before reading".