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author | Willem de Bruijn <willemb@google.com> | 2017-02-03 23:20:49 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-18 14:11:42 (GMT) |
commit | b90cb484c068b3fd30aee322506d38bcc2f43838 (patch) | |
tree | 4b3ae45d4266d6c2653a57d81f105da9a66bd2ce /drivers/net/usb/pegasus.c | |
parent | 26989c9d9904e3626443336bcefab0b6e7077d99 (diff) | |
download | linux-b90cb484c068b3fd30aee322506d38bcc2f43838.tar.xz |
macvtap: read vnet_hdr_size once
[ Upstream commit 837585a5375c38d40361cfe64e6fd11e1addb936 ]
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.
Macvtap functions read the value once, but unless READ_ONCE is used,
the compiler may ignore this and read multiple times. Enforce a single
read and locally cached value to avoid updates between test and use.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Suggested-by: 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 'drivers/net/usb/pegasus.c')
0 files changed, 0 insertions, 0 deletions