linux-kernel - [PATCH v2 2/2] Bluetooth: btusb: Fix double free in handle_dump_pkt

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Date:   Fri, 17 Nov 2023 11:28:34 -0800
From:   Manish Mandlik <mmandlik@...gle.com>
To:     marcel@...tmann.org, luiz.dentz@...il.com
Cc:     chromeos-bluetooth-upstreaming@...omium.org,
        linux-bluetooth@...r.kernel.org,
        Manish Mandlik <mmandlik@...gle.com>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Tim Jiang <quic_tjiang@...cinc.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] Bluetooth: btusb: Fix double free in handle_dump_pkt_qca()

The hci_devcd_init() returns 0 on success. Do not use this return value
when eturning from handle_dump_pkt_qca() as it incorrectly indicates
that it's not a dump packet.

This causes the first dump skb to be processed by both hci_devcd_rx()
and hci_recv_frame() leading to double free.

Fixes: 20981ce2d5a5 ("Bluetooth: btusb: Add WCN6855 devcoredump support")

Signed-off-by: Manish Mandlik <mmandlik@...gle.com>
---

(no changes since v1)

 drivers/bluetooth/btusb.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 35a26440cabd..d23c992502c5 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3531,10 +3531,11 @@ static int handle_dump_pkt_qca(struct hci_dev *hdev, struct sk_buff *skb)
 			goto out;
 		}
 
-		ret = hci_devcd_init(hdev, dump_size);
-		if (ret < 0) {
-			bt_dev_err(hdev, "memdump init error(%d)", ret);
-			goto out;
+		if (hci_devcd_init(hdev, dump_size) < 0) {
+			bt_dev_err(hdev, "memdump init error");
+			clear_bit(BTUSB_HW_SSR_ACTIVE, &btdata->flags);
+			kfree_skb(skb);
+			return ret;
 		}
 
 		btdata->qca_dump.ram_dump_size = dump_size;
-- 
2.43.0.rc0.421.g78406f8d94-goog