diff options
| author | Willem de Bruijn <willemb@google.com> | 2017-02-03 18:20:48 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-18 16:39:27 +0100 |
| commit | 625bd9e43b3b6a5d796c6a5bac660dc405a60fa2 (patch) | |
| tree | 6ecb8b8717326a83d670ccfd71f94aab42de451d /net | |
| parent | 82e9f6b90a0e7fbc017bdce23845c7580db6f657 (diff) | |
tun: read vnet_hdr_sz once
[ Upstream commit e1edab87faf6ca30cd137e0795bc73aa9a9a22ec ]
When IFF_VNET_HDR is enabled, a virtio_net header must precede data.
Data length is verified to be greater than or equal to expected header
length tun->vnet_hdr_sz before copying.
Read this value once and cache locally, as it can be updated between
the test and use (TOCTOU).
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
CC: Eric Dumazet <edumazet@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions