From: Vishwanath Pai vpai@akamai.com
[ Upstream commit c7aa1a76d4a0a3c401025b60c401412bbb60f8c6 ]
This patch introduced a regression: commit 48596a8ddc46 ("netfilter: ipset: Fix adding an IPv4 range containing more than 2^31 addresses")
The variable e.ip is passed to adtfn() function which finally adds the ip address to the set. The patch above refactored the for loop and moved e.ip = htonl(ip) to the end of the for loop.
What this means is that if the value of "ip" changes between the first assignement of e.ip and the forloop, then e.ip is pointing to a different ip address than "ip".
Test case: $ ipset create jdtest_tmp hash:ip family inet hashsize 2048 maxelem 100000 $ ipset add jdtest_tmp 10.0.1.1/31 ipset v6.21.1: Element cannot be added to the set: it's already added
The value of ip gets updated inside the "else if (tb[IPSET_ATTR_CIDR])" block but e.ip is still pointing to the old value.
Fixes: 48596a8ddc46 ("netfilter: ipset: Fix adding an IPv4 range containing more than 2^31 addresses") Reviewed-by: Joshua Hunt johunt@akamai.com Signed-off-by: Vishwanath Pai vpai@akamai.com Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/netfilter/ipset/ip_set_hash_ip.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/net/netfilter/ipset/ip_set_hash_ip.c b/net/netfilter/ipset/ip_set_hash_ip.c index 361f4fd69bf4..d7a81b2250e7 100644 --- a/net/netfilter/ipset/ip_set_hash_ip.c +++ b/net/netfilter/ipset/ip_set_hash_ip.c @@ -150,18 +150,16 @@ hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[], if (((u64)ip_to - ip + 1) >> (32 - h->netmask) > IPSET_MAX_RANGE) return -ERANGE;
- if (retried) { + if (retried) ip = ntohl(h->next.ip); - e.ip = htonl(ip); - } for (; ip <= ip_to;) { + e.ip = htonl(ip); ret = adtfn(set, &e, &ext, &ext, flags); if (ret && !ip_set_eexist(ret, flags)) return ret;
ip += hosts; - e.ip = htonl(ip); - if (e.ip == 0) + if (ip == 0) return 0;
ret = 0;