linux-kernel - [PATCH RESEND] Bluetooth: btusb: medaitek: fix double free of skb in coredump

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Message-Id: <da0859c4b24d314d9ff38179c26a58ee7e3f16d6.1713395895.git.sean.wang@kernel.org>
Date: Wed, 17 Apr 2024 16:27:38 -0700
From: sean.wang@...nel.org
To: luiz.dentz@...il.com,
	marcel@...tmann.org,
	johan.hedberg@...il.com
Cc: sean.wang@...iatek.com,
	chris.lu@...iatek.com,
	Deren.Wu@...iatek.com,
	jsiuda@...gle.com,
	frankgor@...gle.com,
	abhishekpandit@...gle.com,
	michaelfsun@...gle.com,
	mmandlik@...gle.com,
	abhishekpandit@...omium.org,
	mcchou@...omium.org,
	shawnku@...gle.com,
	linux-bluetooth@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH RESEND] Bluetooth: btusb: medaitek: fix double free of skb in coredump

From: Sean Wang <sean.wang@...iatek.com>

hci_devcd_append() would free the skb on error so the caller don't
have to free it again otherwise it would cause the double free of skb.

Fixes: 0b7015132878 ("Bluetooth: btusb: mediatek: add MediaTek devcoredump support")
Reported-by : Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
---
 drivers/bluetooth/btmtk.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c
index ac8ebccd3507..812fd2a8f853 100644
--- a/drivers/bluetooth/btmtk.c
+++ b/drivers/bluetooth/btmtk.c
@@ -380,8 +380,10 @@ int btmtk_process_coredump(struct hci_dev *hdev, struct sk_buff *skb)
 	switch (data->cd_info.state) {
 	case HCI_DEVCOREDUMP_IDLE:
 		err = hci_devcd_init(hdev, MTK_COREDUMP_SIZE);
-		if (err < 0)
+		if (err < 0) {
+			kfree_skb(skb);
 			break;
+		}
 		data->cd_info.cnt = 0;
 
 		/* It is supposed coredump can be done within 5 seconds */
@@ -407,9 +409,6 @@ int btmtk_process_coredump(struct hci_dev *hdev, struct sk_buff *skb)
 		break;
 	}
 
-	if (err < 0)
-		kfree_skb(skb);
-
 	return err;
 }
 EXPORT_SYMBOL_GPL(btmtk_process_coredump);
-- 
2.25.1