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8551844d2c
In AP mode, 'sta' could be NULL if sending broadcast/multicast packets,
so we should check before accessing, or it causes crash:
BUG: kernel NULL pointer dereference, address: 0000000000000004
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 2 PID: 92 Comm: kworker/u33:0 Tainted: G OE
Workqueue: rtw89_tx_wq rtw89_core_txq_work [rtw89_core]
RIP: 0010:rtw89_core_tx_update_desc_info+0x2cc/0x7d0 [rtw89_core]
Code: e2 01 41 be 04 00 00 00 41 8b 84 c4 0c 01 00 00 75 0d 45 31 f6 ...
RSP: 0018:ffffb4cf807afce0 EFLAGS: 00010297
RAX: 0000000000000001 RBX: ffffb4cf807afd48 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffb4cf807afd30 R08: ffff9b28c1e59808 R09: ffff9b28c0297100
R10: 00000000052cf7c4 R11: 00000000052cf7c4 R12: ffff9b28c1602040
R13: ffff9b28c07b3000 R14: 0000000000000004 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff9b2a73280000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 00000001ca410003 CR4: 00000000000606e0
Call Trace:
<TASK>
rtw89_core_tx_write+0x7c/0x100 [rtw89_core]
rtw89_core_txq_work+0x1b4/0x530 [rtw89_core]
process_one_work+0x222/0x3f0
worker_thread+0x50/0x3f0
kthread+0x16b/0x190
? rescuer_thread+0x3a0/0x3a0
? set_kthread_struct+0x50/0x50
ret_from_fork+0x22/0x30
</TASK>
Fixes: e5307c9cd7 ("wifi: rtw89: set data lowest rate according to AP supported rate")
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230406093009.5869-1-pkshih@realtek.com
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.