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| author | Willem de Bruijn <willemb@google.com> | 2017-02-04 02:20:48 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-02-07 06:41:27 +0300 |
| commit | e1edab87faf6ca30cd137e0795bc73aa9a9a22ec (patch) | |
| tree | 6bed425132b0eb1c3808a012ad5f81799df0d78c /lib/percpu_counter.c | |
| parent | ccf7abb93af09ad0868ae9033d1ca8108bdaec82 (diff) | |
| download | linux-e1edab87faf6ca30cd137e0795bc73aa9a9a22ec.tar.xz | |
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 'lib/percpu_counter.c')
0 files changed, 0 insertions, 0 deletions