[PATCH v2] Bluetooth: btmtksdio: fix use-after-free at btmtksdio_recv_event

[patchwork-bot+bluetooth at kernel.org]

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Marcel Holtmann <marcel at holtmann.org>:

On Thu, 12 May 2022 06:22:15 +0800 you wrote:
> From: Sean Wang <sean.wang at mediatek.com>
> 
> We should not access skb buffer data anymore after hci_recv_frame was
> called.
> 
> [   39.634809] BUG: KASAN: use-after-free in btmtksdio_recv_event+0x1b0
> [   39.634855] Read of size 1 at addr ffffff80cf28a60d by task kworker
> [   39.634962] Call trace:
> [   39.634974]  dump_backtrace+0x0/0x3b8
> [   39.634999]  show_stack+0x20/0x2c
> [   39.635016]  dump_stack_lvl+0x60/0x78
> [   39.635040]  print_address_description+0x70/0x2f0
> [   39.635062]  kasan_report+0x154/0x194
> [   39.635079]  __asan_report_load1_noabort+0x44/0x50
> [   39.635099]  btmtksdio_recv_event+0x1b0/0x1c4
> [   39.635129]  btmtksdio_txrx_work+0x6cc/0xac4
> [   39.635157]  process_one_work+0x560/0xc5c
> [   39.635177]  worker_thread+0x7ec/0xcc0
> [   39.635195]  kthread+0x2d0/0x3d0
> [   39.635215]  ret_from_fork+0x10/0x20
> [   39.635247] Allocated by task 0:
> [   39.635260] (stack is not available)
> [   39.635281] Freed by task 2392:
> [   39.635295]  kasan_save_stack+0x38/0x68
> [   39.635319]  kasan_set_track+0x28/0x3c
> [   39.635338]  kasan_set_free_info+0x28/0x4c
> [   39.635357]  ____kasan_slab_free+0x104/0x150
> [   39.635374]  __kasan_slab_free+0x18/0x28
> [   39.635391]  slab_free_freelist_hook+0x114/0x248
> [   39.635410]  kfree+0xf8/0x2b4
> [   39.635427]  skb_free_head+0x58/0x98
> [   39.635447]  skb_release_data+0x2f4/0x410
> [   39.635464]  skb_release_all+0x50/0x60
> [   39.635481]  kfree_skb+0xc8/0x25c
> [   39.635498]  hci_event_packet+0x894/0xca4 [bluetooth]
> [   39.635721]  hci_rx_work+0x1c8/0x68c [bluetooth]
> [   39.635925]  process_one_work+0x560/0xc5c
> [   39.635951]  worker_thread+0x7ec/0xcc0
> [   39.635970]  kthread+0x2d0/0x3d0
> [   39.635990]  ret_from_fork+0x10/0x20
> [   39.636021] The buggy address belongs to the object at ffffff80cf28a600
>                 which belongs to the cache kmalloc-512 of size 512
> [   39.636039] The buggy address is located 13 bytes inside of
>                 512-byte region [ffffff80cf28a600, ffffff80cf28a800)
> 
> [...]

Here is the summary with links:
  - [v2] Bluetooth: btmtksdio: fix use-after-free at btmtksdio_recv_event
    https://git.kernel.org/bluetooth/bluetooth-next/c/0fab6361c4ba

You are awesome, thank you!
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