From b938790e70540bf4f2e653dcd74b232494d06c8f Mon Sep 17 00:00:00 2001
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Fri, 15 Sep 2023 13:24:47 -0700
Subject: [PATCH] Bluetooth: hci_codec: Fix leaking content of local_codecs
Git-commit: b938790e70540bf4f2e653dcd74b232494d06c8f
Patch-mainline: v6.6-rc5
References: git-fixes CVE-2023-52518 bsc#1221056

The following memory leak can be observed when the controller supports
codecs which are stored in local_codecs list but the elements are never
Freed: 

unreferenced object 0xffff88800221d840 (size 32):
  comm "kworker/u3:0", pid 36, jiffies 4294898739 (age 127.060s)
  hex dump (first 32 bytes):
    f8 d3 02 03 80 88 ff ff 80 d8 21 02 80 88 ff ff  ..........!.....
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffffb324f557>] __kmalloc+0x47/0x120
    [<ffffffffb39ef37d>] hci_codec_list_add.isra.0+0x2d/0x160
    [<ffffffffb39ef643>] hci_read_codec_capabilities+0x183/0x270
    [<ffffffffb39ef9ab>] hci_read_supported_codecs+0x1bb/0x2d0
    [<ffffffffb39f162e>] hci_read_local_codecs_sync+0x3e/0x60
    [<ffffffffb39ff1b3>] hci_dev_open_sync+0x943/0x11e0
    [<ffffffffb396d55d>] hci_power_on+0x10d/0x3f0
    [<ffffffffb30c99b4>] process_one_work+0x404/0x800
    [<ffffffffb30ca134>] worker_thread+0x374/0x670
    [<ffffffffb30d9108>] kthread+0x188/0x1c0
    [<ffffffffb304db6b>] ret_from_fork+0x2b/0x50
    [<ffffffffb300206a>] ret_from_fork_asm+0x1a/0x30

Cc: stable@vger.kernel.org
Fixes: 8961987f3f5f ("Bluetooth: Enumerate local supported codec and cache details")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 net/bluetooth/hci_core.c  | 1 +
 net/bluetooth/hci_event.c | 1 +
 net/bluetooth/hci_sync.c  | 1 +
 3 files changed, 3 insertions(+)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 9e89843c259b..195aea2198a9 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2786,6 +2786,7 @@ void hci_release_dev(struct hci_dev *hdev)
 	hci_conn_params_clear_all(hdev);
 	hci_discovery_filter_clear(hdev);
 	hci_blocked_keys_clear(hdev);
+	hci_codec_list_clear(&hdev->local_codecs);
 	hci_dev_unlock(hdev);
 
 	ida_simple_remove(&hci_index_ida, hdev->id);
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 35f251041eeb..31d02b54eea1 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -33,6 +33,7 @@
 
 #include "hci_request.h"
 #include "hci_debugfs.h"
+#include "hci_codec.h"
 #include "a2mp.h"
 #include "amp.h"
 #include "smp.h"
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index fd7c5d902856..d06e07a0ea5a 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -5074,6 +5074,7 @@ int hci_dev_close_sync(struct hci_dev *hdev)
 	memset(hdev->eir, 0, sizeof(hdev->eir));
 	memset(hdev->dev_class, 0, sizeof(hdev->dev_class));
 	bacpy(&hdev->random_addr, BDADDR_ANY);
+	hci_codec_list_clear(&hdev->local_codecs);
 
 	hci_dev_put(hdev);
 	return err;
-- 
2.35.3