From 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be Mon Sep 17 00:00:00 2001
From: Soenke Huster <soenke.huster@eknoes.de>
Date: Wed, 12 Oct 2022 09:45:06 +0200
Subject: [PATCH] Bluetooth: virtio_bt: Use skb_put to set length
Git-commit: 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be
Patch-mainline: v6.1-rc4
References: git-fixes

By using skb_put we ensure that skb->tail is set
correctly. Currently, skb->tail is always zero, which
leads to errors, such as the following page fault in
Rfcomm_recv_frame: 

    BUG: unable to handle page fault for address: ffffed1021de29ff
    #PF: supervisor read access in kernel mode
    #PF: error_code(0x0000) - not-present page
    RIP: 0010:rfcomm_run+0x831/0x4040 (net/bluetooth/rfcomm/core.c:1751)

Fixes: afd2daa26c7a ("Bluetooth: Add support for virtio transport driver")
Signed-off-by: Soenke Huster <soenke.huster@eknoes.de>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/bluetooth/virtio_bt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/virtio_bt.c b/drivers/bluetooth/virtio_bt.c
index 67c21263f9e0..fd281d439505 100644
--- a/drivers/bluetooth/virtio_bt.c
+++ b/drivers/bluetooth/virtio_bt.c
@@ -219,7 +219,7 @@ static void virtbt_rx_work(struct work_struct *work)
 	if (!skb)
 		return;
 
-	skb->len = len;
+	skb_put(skb, len);
 	virtbt_rx_handle(vbt, skb);
 
 	if (virtbt_add_inbuf(vbt) < 0)
-- 
2.35.3