From 84967deee9d9870b15bc4c3acb50f1d401807902 Mon Sep 17 00:00:00 2001 From: Minhong He Date: Fri, 15 Aug 2025 14:38:45 +0800 Subject: [PATCH] ipv6: sr: validate HMAC algorithm ID in seg6_hmac_info_add The seg6_genl_sethmac() directly uses the algorithm ID provided by the userspace without verifying whether it is an HMAC algorithm supported by the system. If an unsupported HMAC algorithm ID is configured, packets using SRv6 HMAC will be dropped during encapsulation or decapsulation. Fixes: 4f4853dc1c9c ("ipv6: sr: implement API to control SR HMAC structure") Signed-off-by: Minhong He Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250815063845.85426-1-heminhong@kylinos.cn Signed-off-by: Jakub Kicinski --- net/ipv6/seg6_hmac.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv6/seg6_hmac.c b/net/ipv6/seg6_hmac.c index f78ecb6ad8383..d77b52523b6a8 100644 --- a/net/ipv6/seg6_hmac.c +++ b/net/ipv6/seg6_hmac.c @@ -304,6 +304,9 @@ int seg6_hmac_info_add(struct net *net, u32 key, struct seg6_hmac_info *hinfo) struct seg6_pernet_data *sdata = seg6_pernet(net); int err; + if (!__hmac_get_algo(hinfo->alg_id)) + return -EINVAL; + err = rhashtable_lookup_insert_fast(&sdata->hmac_infos, &hinfo->node, rht_params); -- 2.39.5