This is a note to let you know that I've just added the patch titled
Bluetooth: msft: fix slab-use-after-free in msft_do_close()
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bluetooth-msft-fix-slab-use-after-free-in-msft_do_cl.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a9c00a2cb7935943d8e29c24046c3a33bdc5fad2
Author: Sungwoo Kim <iam@xxxxxxxxxxxx>
Date: Tue Apr 30 12:20:51 2024 -0400
Bluetooth: msft: fix slab-use-after-free in msft_do_close()
[ Upstream commit 10f9f426ac6e752c8d87bf4346930ba347aaabac ]
Tying the msft->data lifetime to hdev by freeing it in
hci_release_dev() to fix the following case:
[use]
msft_do_close()
msft = hdev->msft_data;
if (!msft) ...(1) <- passed.
return;
mutex_lock(&msft->filter_lock); ...(4) <- used after freed.
[free]
msft_unregister()
msft = hdev->msft_data;
hdev->msft_data = NULL; ...(2)
kfree(msft); ...(3) <- msft is freed.
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock_common
kernel/locking/mutex.c:587 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0x8f/0xc30
kernel/locking/mutex.c:752
Read of size 8 at addr ffff888106cbbca8 by task kworker/u5:2/309
Fixes: bf6a4e30ffbd ("Bluetooth: disable advertisement filters during suspend")
Signed-off-by: Sungwoo Kim <iam@xxxxxxxxxxxx>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 0592369579ab2..befe645d3f9bf 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2736,8 +2736,6 @@ void hci_unregister_dev(struct hci_dev *hdev)
hci_unregister_suspend_notifier(hdev);
- msft_unregister(hdev);
-
hci_dev_do_close(hdev);
if (!test_bit(HCI_INIT, &hdev->flags) &&
@@ -2791,6 +2789,7 @@ void hci_release_dev(struct hci_dev *hdev)
hci_discovery_filter_clear(hdev);
hci_blocked_keys_clear(hdev);
hci_codec_list_clear(&hdev->local_codecs);
+ msft_release(hdev);
hci_dev_unlock(hdev);
ida_destroy(&hdev->unset_handle_ida);
diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c
index 9612c5d1b13f6..d039683d3bdd4 100644
--- a/net/bluetooth/msft.c
+++ b/net/bluetooth/msft.c
@@ -769,7 +769,7 @@ void msft_register(struct hci_dev *hdev)
mutex_init(&msft->filter_lock);
}
-void msft_unregister(struct hci_dev *hdev)
+void msft_release(struct hci_dev *hdev)
{
struct msft_data *msft = hdev->msft_data;
diff --git a/net/bluetooth/msft.h b/net/bluetooth/msft.h
index 2a63205b377b7..fe538e9c91c01 100644
--- a/net/bluetooth/msft.h
+++ b/net/bluetooth/msft.h
@@ -14,7 +14,7 @@
bool msft_monitor_supported(struct hci_dev *hdev);
void msft_register(struct hci_dev *hdev);
-void msft_unregister(struct hci_dev *hdev);
+void msft_release(struct hci_dev *hdev);
void msft_do_open(struct hci_dev *hdev);
void msft_do_close(struct hci_dev *hdev);
void msft_vendor_evt(struct hci_dev *hdev, void *data, struct sk_buff *skb);
@@ -35,7 +35,7 @@ static inline bool msft_monitor_supported(struct hci_dev *hdev)
}
static inline void msft_register(struct hci_dev *hdev) {}
-static inline void msft_unregister(struct hci_dev *hdev) {}
+static inline void msft_release(struct hci_dev *hdev) {}
static inline void msft_do_open(struct hci_dev *hdev) {}
static inline void msft_do_close(struct hci_dev *hdev) {}
static inline void msft_vendor_evt(struct hci_dev *hdev, void *data,
