linux-kernel - [PATCH] Bluetooth: btintel: fix dereference after free in btintel_ppag

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Date:   Thu, 17 Aug 2023 17:35:28 +0800
From:   Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
To:     <marcel@...tmann.org>
CC:     <johan.hedberg@...il.com>, <luiz.dentz@...il.com>,
        <seema.sreemantha@...el.com>, <kiran.k@...el.com>,
        <linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yusongping@...wei.com>, <artem.kuzin@...wei.com>
Subject: [PATCH] Bluetooth: btintel: fix dereference after free in btintel_ppag_callback()

'buffer.pointer' is freed and then dereferenced via 'p' pointer at
'bt_dev_warn' function call.

Fixes: c585a92b2f9c ("Bluetooth: btintel: Set Per Platform Antenna Gain(PPAG)")
Co-developed-by: Ivanov Mikhail <ivanov.mikhail1@...wei-partners.com>
Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
---
 drivers/bluetooth/btintel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index d9349ba48..4ac1eba9c 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -1340,11 +1340,11 @@ static acpi_status btintel_ppag_callback(acpi_handle handle, u32 lvl, void *data
 	p = buffer.pointer;
 	ppag = (struct btintel_ppag *)data;
 
 	if (p->type != ACPI_TYPE_PACKAGE || p->package.count != 2) {
-		kfree(buffer.pointer);
 		bt_dev_warn(hdev, "PPAG-BT: Invalid object type: %d or package count: %d",
 			    p->type, p->package.count);
+		kfree(buffer.pointer);
 		ppag->status = AE_ERROR;
 		return AE_ERROR;
 	}
 
-- 
2.34.1