xen-netback: don't disconnect frontend when seeing oversize packet

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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>

...

This commit is contained in:

Wei Liu 2013-04-22 02:20:43 +00:00 • committed by David S. Miller

parent 2810e5b9a7

commit 03393fd5cc

1 changed files with 16 additions and 6 deletions

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drivers/net/xen-netback/netback.c

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