diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2017-02-21 09:33:18 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-26 11:10:51 +0100 |
| commit | 481aedf869fbf2d4503ca0005dbd68b78422955a (patch) | |
| tree | 76a6ad15a5555f0a3e383a88e00b6ca45b4d12b2 /net/socket.c | |
| parent | 7c56012e92b51030b13c4652a9494d422562d5d5 (diff) | |
ip: fix IP_CHECKSUM handling
[ Upstream commit ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32 ]
The skbs processed by ip_cmsg_recv() are not guaranteed to
be linear e.g. when sending UDP packets over loopback with
MSGMORE.
Using csum_partial() on [potentially] the whole skb len
is dangerous; instead be on the safe side and use skb_checksum().
Thanks to syzkaller team to detect the issue and provide the
reproducer.
v1 -> v2:
- move the variable declaration in a tighter scope
Fixes: ad6f939ab193 ("ip: Add offset parameter to ip_cmsg_recv")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.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/socket.c')
0 files changed, 0 insertions, 0 deletions