[PATCH 4.19 73/77] netfilter: x_tables: Update remaining dereference to RCU
From: Greg Kroah-Hartman
Date: Mon Jan 11 2021 - 08:50:37 EST
From: Subash Abhinov Kasiviswanathan <subashab@xxxxxxxxxxxxxx>
commit 443d6e86f821a165fae3fc3fc13086d27ac140b1 upstream.
This fixes the dereference to fetch the RCU pointer when holding
the appropriate xtables lock.
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Fixes: cc00bcaa5899 ("netfilter: x_tables: Switch synchronization to RCU")
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@xxxxxxxxxxxxxx>
Reviewed-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/netfilter/arp_tables.c | 2 +-
net/ipv4/netfilter/ip_tables.c | 2 +-
net/ipv6/netfilter/ip6_tables.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1405,7 +1405,7 @@ static int compat_get_entries(struct net
xt_compat_lock(NFPROTO_ARP);
t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
if (!IS_ERR(t)) {
- const struct xt_table_info *private = t->private;
+ const struct xt_table_info *private = xt_table_get_private_protected(t);
struct xt_table_info info;
ret = compat_table_info(private, &info);
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1619,7 +1619,7 @@ compat_get_entries(struct net *net, stru
xt_compat_lock(AF_INET);
t = xt_find_table_lock(net, AF_INET, get.name);
if (!IS_ERR(t)) {
- const struct xt_table_info *private = t->private;
+ const struct xt_table_info *private = xt_table_get_private_protected(t);
struct xt_table_info info;
ret = compat_table_info(private, &info);
if (!ret && get.size == info.size)
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1628,7 +1628,7 @@ compat_get_entries(struct net *net, stru
xt_compat_lock(AF_INET6);
t = xt_find_table_lock(net, AF_INET6, get.name);
if (!IS_ERR(t)) {
- const struct xt_table_info *private = t->private;
+ const struct xt_table_info *private = xt_table_get_private_protected(t);
struct xt_table_info info;
ret = compat_table_info(private, &info);
if (!ret && get.size == info.size)