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Make sure skb_mac_header(), skb_mac_offset() and skb_mac_header_len() uses are not fooled if the mac header has not been set. These checks are enabled if CONFIG_DEBUG_NET=y This commit will likely expose existing bugs in linux networking stacks. Signed-off-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20220620093017.3366713-1-eric.dumazet@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>