From 74cb39735b6cd0aff4b5584158f09376fd97aadf Mon Sep 17 00:00:00 2001 From: Kyle Zeng Date: Mon, 10 Aug 2026 15:10:34 -0700 Subject: [PATCH] ipvs: reject invalid states in connection template sync records IPVS sync receivers validate protocol states before creating or updating a connection. For connection templates, however, they only log states outside the template state range and still store the value in the connection. A template can be returned by ordinary connection lookup. TCP and SCTP then use the invalid state as an index into their transition tables. Reject invalid template states in both sync protocol versions before looking up or modifying a connection. The version 1 path handles both IPv4 and IPv6 records. Fixes: 275411430f89 ("ipvs: add assured state for conn templates") Cc: stable@vger.kernel.org Assisted-by: Codex:gpt-5.6-sol Signed-off-by: Kyle Zeng Acked-by: Julian Anastasov Signed-off-by: Pablo Neira Ayuso --- net/netfilter/ipvs/ip_vs_sync.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c index ea5fdd4f4ce7..1deb063cd72c 100644 --- a/net/netfilter/ipvs/ip_vs_sync.c +++ b/net/netfilter/ipvs/ip_vs_sync.c @@ -999,10 +999,10 @@ static void ip_vs_process_message_v0(struct netns_ipvs *ipvs, const char *buffer pp->name, state); continue; } - } else { - if (state >= IP_VS_CTPL_S_LAST) - IP_VS_DBG(7, "BACKUP v0, Invalid tpl state %u\n", - state); + } else if (state >= IP_VS_CTPL_S_LAST) { + IP_VS_DBG(7, "BACKUP v0, Invalid tpl state %u\n", + state); + continue; } ip_vs_conn_fill_param(ipvs, AF_INET, s->protocol, @@ -1159,10 +1159,10 @@ static inline int ip_vs_proc_sync_conn(struct netns_ipvs *ipvs, __u8 *p, __u8 *m retc = 40; goto out; } - } else { - if (state >= IP_VS_CTPL_S_LAST) - IP_VS_DBG(7, "BACKUP, Invalid tpl state %u\n", - state); + } else if (state >= IP_VS_CTPL_S_LAST) { + IP_VS_DBG(7, "BACKUP, Invalid tpl state %u\n", state); + retc = 40; + goto out; } if (ip_vs_conn_fill_param_sync(ipvs, af, s, ¶m, pe_data, pe_data_len, pe_name, pe_name_len)) {