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Date:   Thu, 4 Aug 2022 18:03:46 +0800
From:   Herbert Xu <>
To:     Abhishek Shah <>
        Gabriel Ryan <>,
        Fan Du <>,
        Steffen Klassert <>
Subject: [PATCH] af_key: Do not call xfrm_probe_algs in parallel

When namespace support was added to xfrm/afkey, it caused the
previously single-threaded call to xfrm_probe_algs to become
multi-threaded.  This is buggy and needs to be fixed with a mutex.

Reported-by: Abhishek Shah <>
Fixes: 283bc9f35bbb ("xfrm: Namespacify xfrm state/policy locks")
Signed-off-by: Herbert Xu <>

diff --git a/net/key/af_key.c b/net/key/af_key.c
index fb16d7c4e1b8..20e73643b9c8 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1697,9 +1697,12 @@ static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sad
 		pfk->registered |= (1<<hdr->sadb_msg_satype);
+	mutex_lock(&pfkey_mutex);
 	supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
+	mutex_unlock(&pfkey_mutex);
 	if (!supp_skb) {
 		if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
 			pfk->registered &= ~(1<<hdr->sadb_msg_satype);
Email: Herbert Xu <>
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