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From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To: linux-bluetooth@vger.kernel.org
Subject: [PATCH v1 3/4] Bluetooth: btusb: Fix memory leak
Date: Wed, 28 Feb 2024 12:18:37 -0500
Message-ID: <20240228171838.2414532-3-luiz.dentz@gmail.com>
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From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This checks if CONFIG_DEV_COREDUMP is enabled before attempting to clone
the skb and also make sure btmtk_process_coredump frees the skb passed
following the same logic.

Fixes: 0b7015132878 ("Bluetooth: btusb: mediatek: add MediaTek devcoredump support")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 drivers/bluetooth/btmtk.c |  4 +++-
 drivers/bluetooth/btusb.c | 10 ++++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c
index aaabb732082c..285418dbb43f 100644
--- a/drivers/bluetooth/btmtk.c
+++ b/drivers/bluetooth/btmtk.c
@@ -372,8 +372,10 @@ int btmtk_process_coredump(struct hci_dev *hdev, struct sk_buff *skb)
 	struct btmediatek_data *data = hci_get_priv(hdev);
 	int err;
 
-	if (!IS_ENABLED(CONFIG_DEV_COREDUMP))
+	if (!IS_ENABLED(CONFIG_DEV_COREDUMP)) {
+		kfree_skb(skb);
 		return 0;
+	}
 
 	switch (data->cd_info.state) {
 	case HCI_DEVCOREDUMP_IDLE:
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index d31edad7a056..6cb87d47ad7d 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3273,7 +3273,6 @@ static int btusb_recv_acl_mtk(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct btusb_data *data = hci_get_drvdata(hdev);
 	u16 handle = le16_to_cpu(hci_acl_hdr(skb)->handle);
-	struct sk_buff *skb_cd;
 
 	switch (handle) {
 	case 0xfc6f:		/* Firmware dump from device */
@@ -3286,9 +3285,12 @@ static int btusb_recv_acl_mtk(struct hci_dev *hdev, struct sk_buff *skb)
 		 * for backward compatibility, so we have to clone the packet
 		 * extraly for the in-kernel coredump support.
 		 */
-		skb_cd = skb_clone(skb, GFP_ATOMIC);
-		if (skb_cd)
-			btmtk_process_coredump(hdev, skb_cd);
+		if (IS_ENABLED(CONFIG_DEV_COREDUMP)) {
+			struct sk_buff *skb_cd = skb_clone(skb, GFP_ATOMIC);
+
+			if (skb_cd)
+				btmtk_process_coredump(hdev, skb_cd);
+		}
 
 		fallthrough;
 	case 0x05ff:		/* Firmware debug logging 1 */
-- 
2.43.0