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authorWillem de Bruijn <willemb@google.com>2017-02-03 18:20:48 -0500
committerDavid S. Miller <davem@davemloft.net>2017-02-06 22:41:27 -0500
commite1edab87faf6ca30cd137e0795bc73aa9a9a22ec (patch)
tree6bed425132b0eb1c3808a012ad5f81799df0d78c /arch
parentccf7abb93af09ad0868ae9033d1ca8108bdaec82 (diff)
tun: read vnet_hdr_sz once
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>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions