2024-02-16 21:35:55

by Luiz Augusto von Dentz

Subject: [PATCH v1] Bluetooth: hci_sync: Fix UAF on hci_abort_conn_sync

From: Luiz Augusto von Dentz <[email protected]>

Fixes the following trace where hci_acl_create_conn_sync attempts to
call hci_abort_conn_sync after timeout:

BUG: KASAN: slab-use-after-free in hci_abort_conn_sync
(net/bluetooth/hci_sync.c:5439)
Read of size 2 at addr ffff88800322c032 by task kworker/u3:2/36

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38
04/01/2014
Workqueue: hci0 hci_cmd_sync_work
Call Trace:
<TASK>
dump_stack_lvl (./arch/x86/include/asm/irqflags.h:26
./arch/x86/include/asm/irqflags.h:67 ./arch/x86/include/asm/irqflags.h:127
lib/dump_stack.c:107)
print_report (mm/kasan/report.c:378 mm/kasan/report.c:488)
? preempt_count_sub (kernel/sched/core.c:5889)
? __virt_addr_valid (./arch/x86/include/asm/preempt.h:103 (discriminator 1)
./include/linux/rcupdate.h:865 (discriminator 1)
./include/linux/mmzone.h:2026 (discriminator 1)
arch/x86/mm/physaddr.c:65 (discriminator 1))
? hci_abort_conn_sync (net/bluetooth/hci_sync.c:5439)
kasan_report (mm/kasan/report.c:603)
? hci_abort_conn_sync (net/bluetooth/hci_sync.c:5439)
hci_abort_conn_sync (net/bluetooth/hci_sync.c:5439)
? __pfx_hci_abort_conn_sync (net/bluetooth/hci_sync.c:5433)
hci_acl_create_conn_sync (net/bluetooth/hci_sync.c:6681)

Fixes: 456561ba8e49 ("Bluetooth: hci_conn: Only do ACL connections sequentially")
Signed-off-by: Luiz Augusto von Dentz <[email protected]>
---
net/bluetooth/hci_sync.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index b7d8e99e2a30..4a28aef2f01f 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -6670,15 +6670,10 @@ static int hci_acl_create_conn_sync(struct hci_dev *hdev, void *data)
else
cp.role_switch = 0x00;

- err = __hci_cmd_sync_status_sk(hdev, HCI_OP_CREATE_CONN,
- sizeof(cp), &cp,
- HCI_EV_CONN_COMPLETE,
- conn->conn_timeout, NULL);
-
- if (err == -ETIMEDOUT)
- hci_abort_conn_sync(hdev, conn, HCI_ERROR_LOCAL_HOST_TERM);
-
- return err;
+ return __hci_cmd_sync_status_sk(hdev, HCI_OP_CREATE_CONN,
+ sizeof(cp), &cp,
+ HCI_EV_CONN_COMPLETE,
+ conn->conn_timeout, NULL);
}

int hci_connect_acl_sync(struct hci_dev *hdev, struct hci_conn *conn)
--
2.43.0

2024-02-20 19:10:54

by patchwork-bot+bluetooth

Subject: Re: [PATCH v1] Bluetooth: hci_sync: Fix UAF on hci_abort_conn_sync

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <[email protected]>:

On Fri, 16 Feb 2024 15:50:05 -0500 you wrote:
> From: Luiz Augusto von Dentz <[email protected]>
>
> Fixes the following trace where hci_acl_create_conn_sync attempts to
> call hci_abort_conn_sync after timeout:
>
> BUG: KASAN: slab-use-after-free in hci_abort_conn_sync
> (net/bluetooth/hci_sync.c:5439)
> Read of size 2 at addr ffff88800322c032 by task kworker/u3:2/36
>
> [...]

Here is the summary with links:
- [v1] Bluetooth: hci_sync: Fix UAF on hci_abort_conn_sync
https://git.kernel.org/bluetooth/bluetooth-next/c/55a7c10e71ae

You are awesome, thank you!
--
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