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

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Message-ID: <tencent_E4F3C6420991AEE0AEEB4C80A7CB06CE5206@qq.com>
Date: Mon,  7 Oct 2024 18:53:53 +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

set skb reserve memory to 0.

#syz test

diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c
index aa6af351d02d..b2e99a83d6c7 100644
--- a/drivers/bluetooth/hci_vhci.c
+++ b/drivers/bluetooth/hci_vhci.c
@@ -492,6 +492,7 @@ static inline ssize_t vhci_get_user(struct vhci_data *data,
 		kfree_skb(skb);
 		return -EFAULT;
 	}
+	memset(skb + len, 0, BT_SKB_RESERVE);
 
 	pkt_type = *((__u8 *) skb->data);
 	skb_pull(skb, 1);