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Bluetooth: msft: fix slab-use-after-free in msft_do_close()

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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: bf6a4e30ff ("Bluetooth: disable advertisement filters during suspend")
Signed-off-by: Sungwoo Kim <iam@sung-woo.kim>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Sungwoo Kim 2024-04-30 12:20:51 -04:00 committed by Luiz Augusto von Dentz
parent 4d7b41c0e4
commit 10f9f426ac
3 changed files with 4 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/bluetooth/hci_core.c
View File

@ -2768,8 +2768,6 @@ 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) &&
@ -2823,6 +2821,7 @@ 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);

2
net/bluetooth/msft.c
View File

@ -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;

4
net/bluetooth/msft.h
View File

@ -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,