From: Soenke Huster <soenke.huster@eknoes.de>
Date: Wed, 12 Oct 2022 07:45:06 +0000 (+0200)
Subject: Bluetooth: virtio_bt: Use skb_put to set length
X-Git-Tag: v6.1-rc5~60^2~9^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=160fbcf3bfb93c3c086427f9f4c8bc70f217e9be;p=platform%2Fkernel%2Flinux-starfive.git

Bluetooth: virtio_bt: Use skb_put to set length

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>
---

diff --git a/drivers/bluetooth/virtio_bt.c b/drivers/bluetooth/virtio_bt.c
index 67c2126..fd281d4 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)