netdev - [PATCH net] inet: control sockets should not use current thread task

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Date:   Tue,  3 Jan 2023 19:27:36 +0000
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        Eric Dumazet <edumazet@...gle.com>,
        syzbot+bebc6f1acdf4cbb79b03@...kaller.appspotmail.com,
        Guillaume Nault <gnault@...hat.com>,
        Benjamin Coddington <bcodding@...hat.com>
Subject: [PATCH net] inet: control sockets should not use current thread task_frag

Because ICMP handlers run from softirq contexts,
they must not use current thread task_frag.

Previously, all sockets allocated by inet_ctl_sock_create()
would use the per-socket page fragment, with no chance of
recursion.

Fixes: 98123866fcf3 ("Treewide: Stop corrupting socket's task_frag")
Reported-by: syzbot+bebc6f1acdf4cbb79b03@...kaller.appspotmail.com
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Guillaume Nault <gnault@...hat.com>
Cc: Benjamin Coddington <bcodding@...hat.com>
---
 net/ipv4/af_inet.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index ab4a06be489b5d410cec603bf56248d31dbc90dd..6c0ec27899431eb56e2f9d0c3a936b77f44ccaca 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1665,6 +1665,7 @@ int inet_ctl_sock_create(struct sock **sk, unsigned short family,
 	if (rc == 0) {
 		*sk = sock->sk;
 		(*sk)->sk_allocation = GFP_ATOMIC;
+		(*sk)->sk_use_task_frag = false;
 		/*
 		 * Unhash it so that IP input processing does not even see it,
 		 * we do not wish this socket to see incoming packets.
-- 
2.39.0.314.g84b9a713c41-goog