]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
net: avoid infinite loop in mpls_gso_segment when mpls_hlen == 0
authorBalazs Nemeth <bnemeth@redhat.com>
Tue, 9 Mar 2021 11:31:01 +0000 (12:31 +0100)
committerDavid S. Miller <davem@davemloft.net>
Wed, 10 Mar 2021 00:12:20 +0000 (16:12 -0800)
commitd348ede32e99d3a04863e9f9b28d224456118c27
treeaa561ac181147df2e9c5b52ed67706e2e26ba9c9
parent924a9bc362a5223cd448ca08c3dde21235adc310
net: avoid infinite loop in mpls_gso_segment when mpls_hlen == 0

A packet with skb_inner_network_header(skb) == skb_network_header(skb)
and ETH_P_MPLS_UC will prevent mpls_gso_segment from pulling any headers
from the packet. Subsequently, the call to skb_mac_gso_segment will
again call mpls_gso_segment with the same packet leading to an infinite
loop. In addition, ensure that the header length is a multiple of four,
which should hold irrespective of the number of stacked labels.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/mpls/mpls_gso.c