netdev - [PATCH] Bluetooth: hci_sync: fix memory leak in hci_update_adv

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Date:   Mon, 9 Jan 2023 09:26:51 +0800
From:   Zhengchao Shao <shaozhengchao@...wei.com>
To:     <linux-bluetooth@...r.kernel.org>, <netdev@...r.kernel.org>,
        <marcel@...tmann.org>, <johan.hedberg@...il.com>,
        <luiz.dentz@...il.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>
CC:     <brian.gix@...el.com>, <weiyongjun1@...wei.com>,
        <yuehaibing@...wei.com>, <shaozhengchao@...wei.com>
Subject: [PATCH] Bluetooth: hci_sync: fix memory leak in hci_update_adv_data()

When hci_cmd_sync_queue() failed in hci_update_adv_data(), inst_ptr is
not freed, which will cause memory leak. Add release process to error
path.

Fixes: 651cd3d65b0f ("Bluetooth: convert hci_update_adv_data to hci_sync")
Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
---
 net/bluetooth/hci_sync.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 9e2d7e4b850c..1485501bd72f 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -6197,10 +6197,15 @@ static int _update_adv_data_sync(struct hci_dev *hdev, void *data)
 int hci_update_adv_data(struct hci_dev *hdev, u8 instance)
 {
 	u8 *inst_ptr = kmalloc(1, GFP_KERNEL);
+	int ret;
 
 	if (!inst_ptr)
 		return -ENOMEM;
 
 	*inst_ptr = instance;
-	return hci_cmd_sync_queue(hdev, _update_adv_data_sync, inst_ptr, NULL);
+	ret = hci_cmd_sync_queue(hdev, _update_adv_data_sync, inst_ptr, NULL);
+	if (ret)
+		kfree(inst_ptr);
+
+	return ret;
 }
-- 
2.34.1