* [PATCH v2] Bluetooth: hci_conn: Fix UAF in create_big_sync and create_big_complete
@ 2026-03-04 22:50 Kai Zen
2026-03-04 22:59 ` [v2] " bluez.test.bot
0 siblings, 1 reply; 2+ messages in thread
From: Kai Zen @ 2026-03-04 22:50 UTC (permalink / raw)
To: linux-bluetooth; +Cc: luiz.von.dentz, stable, marcel
[-- Attachment #1.1: Type: text/plain, Size: 2851 bytes --]
From kai.aizen.dev@gmail.com Mon Sep 17 00:00:00 2001
From: Kai Aizen <kai.aizen.dev@gmail.com>
Date: Wed, 4 Mar 2026 20:00:00 +0200
Subject: [PATCH v2] Bluetooth: hci_conn: Fix UAF in create_big_sync and
create_big_complete
create_big_sync() and create_big_complete() are queued via
hci_cmd_sync_queue() with a raw hci_conn pointer as 'data', but unlike
all other hci_cmd_sync_queue() callbacks that receive an hci_conn pointer
they lack an hci_conn_valid() guard.
If the connection is torn down after the work is queued but before (or
during) execution, the work dereferences a freed hci_conn object.
Race path:
1. hci_connect_bis() queues create_big_sync(conn) on hdev->req_workqueue
2. ISO socket close() triggers hci_conn_drop(); for BIS_LINK timeo=0,
disc_work fires immediately on hdev->workqueue
3. disc_work -> hci_abort_conn -> hci_conn_del() frees conn
4. create_big_sync() dequeued and runs on req_workqueue; conn is
already freed -> slab-use-after-free
The two workqueues are distinct (req_workqueue vs workqueue). The only
lock held by create_big_sync is hci_req_sync_lock; the deletion path
in HCI event handlers holds only hci_dev_lock. No shared lock prevents
concurrent execution.
This is the same bug class fixed for hci_enhanced_setup_sync in commit
98ccd44002d8 ("Bluetooth: hci_conn: Fix UAF in hci_enhanced_setup_sync"),
and for hci_le_create_conn_sync, hci_le_pa_create_sync,
hci_le_big_create_sync, hci_acl_create_conn_sync. create_big_sync and
create_big_complete in hci_conn.c were not included in those sweeps.
Fix: add hci_conn_valid() guard at the start of both functions. In
create_big_sync the 'qos' pointer assignment is moved past the guard
to avoid dereferencing conn before validation.
Fixes: eca0ae4aea66 ("Bluetooth: Add initial implementation of BIS
connections")
Cc: stable@vger.kernel.org
Signed-off-by: Kai Aizen <kai.aizen.dev@gmail.com>
---
net/bluetooth/hci_conn.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index a47f5daffdbf..e7fe9cc7a4a3 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -2119,10 +2119,15 @@
static int create_big_sync(struct hci_dev *hdev, void *data)
{
struct hci_conn *conn = data;
- struct bt_iso_qos *qos = &conn->iso_qos;
u16 interval, sync_interval = 0;
u32 flags = 0;
int err;
+ struct bt_iso_qos *qos;
+
+ if (!hci_conn_valid(hdev, conn))
+ return -ECANCELED;
+
+ qos = &conn->iso_qos;
if (qos->bcast.out.phys == BIT(1))
flags |= MGMT_ADV_FLAG_SEC_2M;
@@ -2196,6 +2201,9 @@
{
struct hci_conn *conn = data;
+ if (!hci_conn_valid(hdev, conn))
+ return;
+
bt_dev_dbg(hdev, "conn %p", conn);
if (err) {
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[-- Attachment #2: 0001-v2-Bluetooth-hci_conn-Fix-UAF-in-create_big_sync.patch --]
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* RE: [v2] Bluetooth: hci_conn: Fix UAF in create_big_sync and create_big_complete
2026-03-04 22:50 [PATCH v2] Bluetooth: hci_conn: Fix UAF in create_big_sync and create_big_complete Kai Zen
@ 2026-03-04 22:59 ` bluez.test.bot
0 siblings, 0 replies; 2+ messages in thread
From: bluez.test.bot @ 2026-03-04 22:59 UTC (permalink / raw)
To: linux-bluetooth, kai.aizen.dev
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Dear Submitter,
Thank you for submitting the patches to the linux bluetooth mailing list.
While preparing the CI tests, the patches you submitted couldn't be applied to the current HEAD of the repository.
----- Output -----
Please resolve the issue and submit the patches again.
---
Regards,
Linux Bluetooth
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-03-04 22:50 [PATCH v2] Bluetooth: hci_conn: Fix UAF in create_big_sync and create_big_complete Kai Zen
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