From 3c20b5948f119ae61ee35ad8584d666020c91581 Mon Sep 17 00:00:00 2001 From: Jeongjun Park Date: Wed, 13 Nov 2024 22:02:09 +0900 Subject: [PATCH] netfilter: ipset: add missing range check in bitmap_ip_uadt commit 35f56c554eb1b56b77b3cf197a6b00922d49033d upstream. When tb[IPSET_ATTR_IP_TO] is not present but tb[IPSET_ATTR_CIDR] exists, the values of ip and ip_to are slightly swapped. Therefore, the range check for ip should be done later, but this part is missing and it seems that the vulnerability occurs. So we should add missing range checks and remove unnecessary range checks. Cc: Reported-by: syzbot+58c872f7790a4d2ac951@syzkaller.appspotmail.com Fixes: 72205fc68bd1 ("netfilter: ipset: bitmap:ip set type support") Signed-off-by: Jeongjun Park Acked-by: Jozsef Kadlecsik Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/netfilter/ipset/ip_set_bitmap_ip.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/net/netfilter/ipset/ip_set_bitmap_ip.c b/net/netfilter/ipset/ip_set_bitmap_ip.c index 1b9df64c62360..b3ca8e87f6292 100644 --- a/net/netfilter/ipset/ip_set_bitmap_ip.c +++ b/net/netfilter/ipset/ip_set_bitmap_ip.c @@ -166,11 +166,8 @@ bitmap_ip_uadt(struct ip_set *set, struct nlattr *tb[], ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to); if (ret) return ret; - if (ip > ip_to) { + if (ip > ip_to) swap(ip, ip_to); - if (ip < map->first_ip) - return -IPSET_ERR_BITMAP_RANGE; - } } else if (tb[IPSET_ATTR_CIDR]) { u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]); @@ -181,7 +178,7 @@ bitmap_ip_uadt(struct ip_set *set, struct nlattr *tb[], ip_to = ip; } - if (ip_to > map->last_ip) + if (ip < map->first_ip || ip_to > map->last_ip) return -IPSET_ERR_BITMAP_RANGE; for (; !before(ip_to, ip); ip += map->hosts) { -- 2.47.2