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(parent: 3d84fa9) | patch
vhost/net: fix heads usage of ubuf_info
authorMichael S. Tsirkin <mst@redhat.com>
Sun, 17 Mar 2013 02:46:09 +0000 (02:46 +0000)
committerDavid S. Miller <davem@davemloft.net>
Sun, 17 Mar 2013 18:28:54 +0000 (14:28 -0400)
commit46aa92d1ba162b4b3d6b7102440e459d4e4ee255
tree98dd50e4b0420724c04fe00b188155fcb41a4476tree | snapshot (tar.gz zip)
parent3d84fa98aca7f05f7010022bc45acb1b50326332commit | diff
vhost/net: fix heads usage of ubuf_info

ubuf info allocator uses guest controlled head as an index,
so a malicious guest could put the same head entry in the ring twice,
and we will get two callbacks on the same value.
To fix use upend_idx which is guaranteed to be unique.

Reported-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Cc: stable@kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/vhost/net.c diff | blob | blame | history