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

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: msft: fix slab-use-after-free in msft_do_close() 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

References

• https://git.kernel.org/stable/c/e3880b531b68f98d3941d83f2f6dd11cf4fd6b76
• https://git.kernel.org/stable/c/a85a60e62355e3bf4802dead7938966824b23940
• https://git.kernel.org/stable/c/4f1de02de07748da80a8178879bc7a1df37fdf56
• https://git.kernel.org/stable/c/10f9f426ac6e752c8d87bf4346930ba347aaabac