Re: [PATCH net v3 2/2] net: avoid infinite loop in mpls_gso_segment when mpls_hlen == 0

On 3/9/21 4:31 AM, Balazs Nemeth wrote:

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 <redacted>
---
 net/mpls/mpls_gso.c | 3 +++
 1 file changed, 3 insertions(+)

Reviewed-by: David Ahern <dsahern@kernel.org>