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ipv6: sr: validate HMAC algorithm ID in seg6_hmac_info_add

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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: 4f4853dc1c ("ipv6: sr: implement API to control SR HMAC structure")
Signed-off-by: Minhong He <heminhong@kylinos.cn>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250815063845.85426-1-heminhong@kylinos.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Minhong He 2025-08-15 14:38:45 +08:00 committed by Jakub Kicinski
parent 864e339697
commit 84967deee9
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/seg6_hmac.c
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@ -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);