linux-kernel - Re: [syzbot] [bluetooth?] KMSAN: uninit-value in hci_rx

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Message-ID: <tencent_E64189A52EEFAEE6CC83A7C746FAD2E6C606@qq.com>
Date: Tue,  8 Oct 2024 17:30:29 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+6ea290ba76d8c1eb1ac2@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] KMSAN: uninit-value in hci_rx_work

If hci_queue_acl is not executed, where does hci_acl_hdr->handle come from ?

#syz test

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index d6976db02c06..6e22eb33fdc7 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3185,6 +3185,7 @@ static void hci_queue_acl(struct hci_chan *chan, struct sk_buff_head *queue,
 
 	hci_skb_pkt_type(skb) = HCI_ACLDATA_PKT;
 
+	printk("conn: %p, cnn H: %u, %s\n", conn, conn->handle, __func__);
 	hci_add_acl_hdr(skb, conn->handle, flags);
 
 	list = skb_shinfo(skb)->frag_list;
@@ -3791,8 +3792,7 @@ static void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb)
 		l2cap_recv_acldata(conn, skb, flags);
 		return;
 	} else {
-		bt_dev_err(hdev, "ACL packet for unknown connection handle %d",
-			   handle);
+		bt_dev_err(hdev, "ACL packet for unknown connection handle");
 	}
 
 	kfree_skb(skb);