From 11d4dd0b20041289e60f0642d458b96389b3125d Mon Sep 17 00:00:00 2001 From: Li RongQing Date: Fri, 22 Feb 2019 21:45:52 +0800 Subject: [PATCH] netfilter: convert the proto argument from u8 to u16 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 Signed-off-by: Li RongQing Signed-off-by: Pablo Neira Ayuso --- include/linux/netfilter/x_tables.h | 4 ++-- net/bridge/netfilter/ebtables.c | 6 +++--- net/netfilter/x_tables.c | 4 ++-- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h index 9077b3ebea08..bf384b3eedb8 100644 --- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -289,9 +289,9 @@ bool xt_find_jump_offset(const unsigned int *offsets, int xt_check_proc_name(const char *name, unsigned int size); -int xt_check_match(struct xt_mtchk_param *, unsigned int size, u_int8_t proto, +int xt_check_match(struct xt_mtchk_param *, unsigned int size, u16 proto, bool inv_proto); -int xt_check_target(struct xt_tgchk_param *, unsigned int size, u_int8_t proto, +int xt_check_target(struct xt_tgchk_param *, unsigned int size, u16 proto, bool inv_proto); int xt_match_to_user(const struct xt_entry_match *m, diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index f77888ec93f1..eb15891f8b9f 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -381,7 +381,7 @@ ebt_check_match(struct ebt_entry_match *m, struct xt_mtchk_param *par, par->match = match; par->matchinfo = m->data; ret = xt_check_match(par, m->match_size, - e->ethproto, e->invflags & EBT_IPROTO); + ntohs(e->ethproto), e->invflags & EBT_IPROTO); if (ret < 0) { module_put(match->me); return ret; @@ -418,7 +418,7 @@ ebt_check_watcher(struct ebt_entry_watcher *w, struct xt_tgchk_param *par, par->target = watcher; par->targinfo = w->data; ret = xt_check_target(par, w->watcher_size, - e->ethproto, e->invflags & EBT_IPROTO); + ntohs(e->ethproto), e->invflags & EBT_IPROTO); if (ret < 0) { module_put(watcher->me); return ret; @@ -744,7 +744,7 @@ ebt_check_entry(struct ebt_entry *e, struct net *net, tgpar.target = target; tgpar.targinfo = t->data; ret = xt_check_target(&tgpar, t->target_size, - e->ethproto, e->invflags & EBT_IPROTO); + ntohs(e->ethproto), e->invflags & EBT_IPROTO); if (ret < 0) { module_put(target->me); goto cleanup_watchers; diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index 13e1ac333fa4..e5e5c64df8d1 100644 --- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -461,7 +461,7 @@ int xt_check_proc_name(const char *name, unsigned int size) EXPORT_SYMBOL(xt_check_proc_name); int xt_check_match(struct xt_mtchk_param *par, - unsigned int size, u_int8_t proto, bool inv_proto) + unsigned int size, u16 proto, bool inv_proto) { int ret; @@ -984,7 +984,7 @@ bool xt_find_jump_offset(const unsigned int *offsets, EXPORT_SYMBOL(xt_find_jump_offset); int xt_check_target(struct xt_tgchk_param *par, - unsigned int size, u_int8_t proto, bool inv_proto) + unsigned int size, u16 proto, bool inv_proto) { int ret; -- 2.30.2