From 8d92d53365395c97cf819a10cda4693f792cd5b6 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Tue, 27 Feb 2018 19:42:34 +0100 Subject: [PATCH] netfilter: compat: prepare xt_compat_init_offsets to return errors commit 9782a11efc072faaf91d4aa60e9d23553f918029 upstream. should have no impact, function still always returns 0. This patch is only to ease review. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- include/linux/netfilter/x_tables.h | 2 +- net/bridge/netfilter/ebtables.c | 10 ++++++++-- net/ipv4/netfilter/arp_tables.c | 10 +++++++--- net/ipv4/netfilter/ip_tables.c | 8 ++++++-- net/ipv6/netfilter/ip6_tables.c | 10 +++++++--- net/netfilter/x_tables.c | 4 +++- 6 files changed, 32 insertions(+), 12 deletions(-) diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h index 56c4ed8c91b8..54f346a45cd0 100644 --- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -508,7 +508,7 @@ void xt_compat_unlock(u_int8_t af); int xt_compat_add_offset(u_int8_t af, unsigned int offset, int delta); void xt_compat_flush_offsets(u_int8_t af); -void xt_compat_init_offsets(u_int8_t af, unsigned int number); +int xt_compat_init_offsets(u8 af, unsigned int number); int xt_compat_calc_jump(u_int8_t af, unsigned int offset); int xt_compat_match_offset(const struct xt_match *match); diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index 16eb99458df4..014a73b46064 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -1819,10 +1819,14 @@ static int compat_table_info(const struct ebt_table_info *info, { unsigned int size = info->entries_size; const void *entries = info->entries; + int ret; newinfo->entries_size = size; - xt_compat_init_offsets(NFPROTO_BRIDGE, info->nentries); + ret = xt_compat_init_offsets(NFPROTO_BRIDGE, info->nentries); + if (ret) + return ret; + return EBT_ENTRY_ITERATE(entries, size, compat_calc_entry, info, entries, newinfo); } @@ -2257,7 +2261,9 @@ static int compat_do_replace(struct net *net, void __user *user, xt_compat_lock(NFPROTO_BRIDGE); - xt_compat_init_offsets(NFPROTO_BRIDGE, tmp.nentries); + ret = xt_compat_init_offsets(NFPROTO_BRIDGE, tmp.nentries); + if (ret < 0) + goto out_unlock; ret = compat_copy_entries(entries_tmp, tmp.entries_size, &state); if (ret < 0) goto out_unlock; diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c index e77ee449831c..356ae7da4f16 100644 --- a/net/ipv4/netfilter/arp_tables.c +++ b/net/ipv4/netfilter/arp_tables.c @@ -768,7 +768,9 @@ static int compat_table_info(const struct xt_table_info *info, memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); newinfo->initial_entries = 0; loc_cpu_entry = info->entries; - xt_compat_init_offsets(NFPROTO_ARP, info->number); + ret = xt_compat_init_offsets(NFPROTO_ARP, info->number); + if (ret) + return ret; xt_entry_foreach(iter, loc_cpu_entry, info->size) { ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); if (ret != 0) @@ -1157,7 +1159,7 @@ static int translate_compat_table(struct xt_table_info **pinfo, struct compat_arpt_entry *iter0; struct arpt_replace repl; unsigned int size; - int ret = 0; + int ret; info = *pinfo; entry0 = *pentry0; @@ -1166,7 +1168,9 @@ static int translate_compat_table(struct xt_table_info **pinfo, j = 0; xt_compat_lock(NFPROTO_ARP); - xt_compat_init_offsets(NFPROTO_ARP, compatr->num_entries); + ret = xt_compat_init_offsets(NFPROTO_ARP, compatr->num_entries); + if (ret) + goto out_unlock; /* Walk through entries, checking offsets. */ xt_entry_foreach(iter0, entry0, compatr->size) { ret = check_compat_entry_size_and_hooks(iter0, info, &size, diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index a7a3f1d66d0a..1a925f2394ad 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -931,7 +931,9 @@ static int compat_table_info(const struct xt_table_info *info, memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); newinfo->initial_entries = 0; loc_cpu_entry = info->entries; - xt_compat_init_offsets(AF_INET, info->number); + ret = xt_compat_init_offsets(AF_INET, info->number); + if (ret) + return ret; xt_entry_foreach(iter, loc_cpu_entry, info->size) { ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); if (ret != 0) @@ -1407,7 +1409,9 @@ translate_compat_table(struct net *net, j = 0; xt_compat_lock(AF_INET); - xt_compat_init_offsets(AF_INET, compatr->num_entries); + ret = xt_compat_init_offsets(AF_INET, compatr->num_entries); + if (ret) + goto out_unlock; /* Walk through entries, checking offsets. */ xt_entry_foreach(iter0, entry0, compatr->size) { ret = check_compat_entry_size_and_hooks(iter0, info, &size, diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c index fad6b384836d..c5fe42e6b7f7 100644 --- a/net/ipv6/netfilter/ip6_tables.c +++ b/net/ipv6/netfilter/ip6_tables.c @@ -949,7 +949,9 @@ static int compat_table_info(const struct xt_table_info *info, memcpy(newinfo, info, offsetof(struct xt_table_info, entries)); newinfo->initial_entries = 0; loc_cpu_entry = info->entries; - xt_compat_init_offsets(AF_INET6, info->number); + ret = xt_compat_init_offsets(AF_INET6, info->number); + if (ret) + return ret; xt_entry_foreach(iter, loc_cpu_entry, info->size) { ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo); if (ret != 0) @@ -1415,7 +1417,7 @@ translate_compat_table(struct net *net, struct compat_ip6t_entry *iter0; struct ip6t_replace repl; unsigned int size; - int ret = 0; + int ret; info = *pinfo; entry0 = *pentry0; @@ -1424,7 +1426,9 @@ translate_compat_table(struct net *net, j = 0; xt_compat_lock(AF_INET6); - xt_compat_init_offsets(AF_INET6, compatr->num_entries); + ret = xt_compat_init_offsets(AF_INET6, compatr->num_entries); + if (ret) + goto out_unlock; /* Walk through entries, checking offsets. */ xt_entry_foreach(iter0, entry0, compatr->size) { ret = check_compat_entry_size_and_hooks(iter0, info, &size, diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index 9c38627e09ea..7ad3d861cb83 100644 --- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -605,10 +605,12 @@ int xt_compat_calc_jump(u_int8_t af, unsigned int offset) } EXPORT_SYMBOL_GPL(xt_compat_calc_jump); -void xt_compat_init_offsets(u_int8_t af, unsigned int number) +int xt_compat_init_offsets(u8 af, unsigned int number) { xt[af].number = number; xt[af].cur = 0; + + return 0; } EXPORT_SYMBOL(xt_compat_init_offsets); -- 2.20.1