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The proto in struct xt_match and struct xt_target is u16, when calling xt_check_target/match, their proto argument is u8, and will cause truncation, it is harmless to ip packet, since ip proto is u8 if a etable's match/target has proto that is u16, will cause the check failure. and convert be16 to short in bridge/netfilter/ebtables.c Signed-off-by: Zhang Yu <zhangyu31@baidu.com> Signed-off-by: Li RongQing <lirongqing@baidu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>