linux-kernel - Forwarded: general protection fault in sigd

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Message-ID: <69045aee.050a0220.e9cb8.0000.GAE@google.com>
Date: Thu, 30 Oct 2025 23:45:02 -0700
From: syzbot <syzbot+1f22cb1769f249df9fa0@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Forwarded: general protection fault in sigd_send

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org.

***

Subject: general protection fault in sigd_send
Author: hsukrut3@...il.com

#syz test
---
 net/atm/signaling.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/atm/signaling.c b/net/atm/signaling.c
index e70ae2c113f9..0fda16975c70 100644
--- a/net/atm/signaling.c
+++ b/net/atm/signaling.c
@@ -63,6 +63,11 @@ static void modify_qos(struct atm_vcc *vcc, struct atmsvc_msg *msg)
 
 static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb)
 {
+	if (vcc != sigd || !test_bit(ATM_VF_SESSION, &vcc->flags)) {
+		dev_kfree_skb(skb);
+		return -EPERM;
+	}
+
 	struct atmsvc_msg *msg;
 	struct atm_vcc *session_vcc;
 	struct sock *sk;
-- 
2.43.0