[PATCH 6.6 311/638] Bluetooth: btusb: Fix memory leak

Sasha Levin
2024-03-24T23:06:21Z

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

[ Upstream commit 79f4127a502c5905f04da1f20a7bbe07103fb77c ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 aaabb732082cd..285418dbb43f5 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 66080fae072f2..8dbdc51976e7b 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3267,7 +3267,6 @@ 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 */
@@ -3280,9 +3279,12 @@ 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