xen-netback: don't disconnect frontend when seeing oversize packet
authorWei Liu <wei.liu2@citrix.com>
Mon, 22 Apr 2013 02:20:43 +0000 (02:20 +0000)
committerDavid S. Miller <davem@davemloft.net>
Mon, 22 Apr 2013 19:37:01 +0000 (15:37 -0400)
commit03393fd5cc2b6cdeec32b704ecba64dbb0feae3c
treee5e6484266da2624a56aa8fca0828e16a19037bb
parent2810e5b9a7731ca5fce22bfbe12c96e16ac44b6f
xen-netback: don't disconnect frontend when seeing oversize packet

Some frontend drivers are sending packets > 64 KiB in length. This length
overflows the length field in the first slot making the following slots have
an invalid length.

Turn this error back into a non-fatal error by dropping the packet. To avoid
having the following slots having fatal errors, consume all slots in the
packet.

This does not reopen the security hole in XSA-39 as if the packet as an
invalid number of slots it will still hit fatal error case.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/xen-netback/netback.c