Subject: CVE-2023-52833: Bluetooth: btusb: Add date->evt_skb is NULL check

From: Greg Kroah-Hartman <[email-masked]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: btusb: Add date->evt_skb is NULL check

fix crash because of null pointers

[ 6104.969662] BUG: kernel NULL pointer dereference, address: 00000000000000c8
[ 6104.969667] #PF: supervisor read access in kernel mode
[ 6104.969668] #PF: error_code(0x0000) - not-present page
[ 6104.969670] PGD 0 P4D 0
[ 6104.969673] Oops: 0000 [#1] SMP NOPTI
[ 6104.969684] RIP: 0010:btusb_mtk_hci_wmt_sync+0x144/0x220 [btusb]
[ 6104.969688] RSP: 0018:ffffb8d681533d48 EFLAGS: 00010246
[ 6104.969689] RAX: 0000000000000000 RBX: ffff8ad560bb2000 RCX: 0000000000000006
[ 6104.969691] RDX: 0000000000000000 RSI: ffffb8d681533d08 RDI: 0000000000000000
[ 6104.969692] RBP: ffffb8d681533d70 R08: 0000000000000001 R09: 0000000000000001
[ 6104.969694] R10: 0000000000000001 R11: 00000000fa83b2da R12: ffff8ad461d1d7c0
[ 6104.969695] R13: 0000000000000000 R14: ffff8ad459618c18 R15: ffffb8d681533d90
[ 6104.969697] FS:  00007f5a1cab9d40(0000) GS:ffff8ad578200000(0000) knlGS:00000
[ 6104.969699] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6104.969700] CR2: 00000000000000c8 CR3: 000000018620c001 CR4: 0000000000760ef0
[ 6104.969701] PKRU: 55555554
[ 6104.969702] Call Trace:
[ 6104.969708]  btusb_mtk_shutdown+0x44/0x80 [btusb]
[ 6104.969732]  hci_dev_do_close+0x470/0x5c0 [bluetooth]
[ 6104.969748]  hci_rfkill_set_block+0x56/0xa0 [bluetooth]
[ 6104.969753]  rfkill_set_block+0x92/0x160
[ 6104.969755]  rfkill_fop_write+0x136/0x1e0
[ 6104.969759]  __vfs_write+0x18/0x40
[ 6104.969761]  vfs_write+0xdf/0x1c0
[ 6104.969763]  ksys_write+0xb1/0xe0
[ 6104.969765]  __x64_sys_write+0x1a/0x20
[ 6104.969769]  do_syscall_64+0x51/0x180
[ 6104.969771]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 6104.969773] RIP: 0033:0x7f5a21f18fef
[ 6104.9] RSP: 002b:00007ffeefe39010 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
[ 6104.969780] RAX: ffffffffffffffda RBX: 000055c10a7560a0 RCX: 00007f5a21f18fef
[ 6104.969781] RDX: 0000000000000008 RSI: 00007ffeefe39060 RDI: 0000000000000012
[ 6104.969782] RBP: 00007ffeefe39060 R08: 0000000000000000 R09: 0000000000000017
[ 6104.969784] R10: 00007ffeefe38d97 R11: 0000000000000293 R12: 0000000000000002
[ 6104.969785] R13: 00007ffeefe39220 R14: 00007ffeefe391a0 R15: 000055c10a72acf0

The Linux kernel CVE team has assigned CVE-2023-52833 to this issue.

Affected and fixed versions
===========================

	Fixed in 5.10.202 with commit 9f8e4d1a4ca1
	Fixed in 5.15.140 with commit f9de14bde56d
	Fixed in 6.1.64 with commit a556f2ef556a
	Fixed in 6.5.13 with commit 0048ddf045bd
	Fixed in 6.6.3 with commit 13b1ebad4c17
	Fixed in 6.7 with commit 624820f7c882

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2023-52833
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	drivers/bluetooth/btusb.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/9f8e4d1a4ca1179aaeb43f91f3e2a386e7e616b3
	https://git.kernel.org/stable/c/f9de14bde56dcbb0765284c6dfc35842b021733c
	https://git.kernel.org/stable/c/a556f2ef556a04790f67f2fa272f1a77336d15a0
	https://git.kernel.org/stable/c/0048ddf045bddc4dacb3e783fd869a2f8fb5be30
	https://git.kernel.org/stable/c/13b1ebad4c175e6a9b0748acbf133c21a15d282a
	https://git.kernel.org/stable/c/624820f7c8826dd010e8b1963303c145f99816e9