b3cec8a42f
[ Upstream commit 0fab6361c4ba17d1b43a991bef4238a3c1754d35 ]
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)
Fixes: 9aebfd4a2200 ("Bluetooth: mediatek: add support for MediaTek MT7663S and MT7668S SDIO devices")
Co-developed-by: Yake Yang <yake.yang@mediatek.com>
Signed-off-by: Yake Yang <yake.yang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.