linux-kernel - [PATCH 2/3] Bluetooth: Call iso

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Message-Id: <20241004003030.160721-3-dev@aaront.org>
Date: Fri,  4 Oct 2024 00:30:29 +0000
From: Aaron Thompson <dev@...ont.org>
To: Johan Hedberg <johan.hedberg@...il.com>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Aaron Thompson <dev@...ont.org>,
	stable@...r.kernel.org
Subject: [PATCH 2/3] Bluetooth: Call iso_exit() on module unload

From: Aaron Thompson <dev@...ont.org>

If iso_init() has been called, iso_exit() must be called on module
unload. Without that, the struct proto that iso_init() registered with
proto_register() becomes invalid, which could cause unpredictable
problems later. In my case, with CONFIG_LIST_HARDENED and
CONFIG_BUG_ON_DATA_CORRUPTION enabled, loading the module again usually
triggers this BUG():

  list_add corruption. next->prev should be prev (ffffffffb5355fd0),
    but was 0000000000000068. (next=ffffffffc0a010d0).
  ------------[ cut here ]------------
  kernel BUG at lib/list_debug.c:29!
  Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI
  CPU: 1 PID: 4159 Comm: modprobe Not tainted 6.10.11-4+bt2-ao-desktop #1
  RIP: 0010:__list_add_valid_or_report+0x61/0xa0
  ...
    __list_add_valid_or_report+0x61/0xa0
    proto_register+0x299/0x320
    hci_sock_init+0x16/0xc0 [bluetooth]
    bt_init+0x68/0xd0 [bluetooth]
    __pfx_bt_init+0x10/0x10 [bluetooth]
    do_one_initcall+0x80/0x2f0
    do_init_module+0x8b/0x230
    __do_sys_init_module+0x15f/0x190
    do_syscall_64+0x68/0x110
  ...

Cc: stable@...r.kernel.org
Fixes: ccf74f2390d6 ("Bluetooth: Add BTPROTO_ISO socket type")
Signed-off-by: Aaron Thompson <dev@...ont.org>
---
 net/bluetooth/mgmt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index e4f564d6f6fb..78a164fab3e1 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -10487,6 +10487,7 @@ int mgmt_init(void)
 
 void mgmt_exit(void)
 {
+	iso_exit();
 	hci_mgmt_chan_unregister(&chan);
 }
 
-- 
2.39.5