Re: [PATCH v2] wifi: ath9k: add range check for conn_rsp_epid in htc_connect_service()

[Toke Høiland-Jørgensen]

Jeongjun Park <aha310510@xxxxxxxxx> writes:

> I found the following bug in my fuzzer:
>
>   UBSAN: array-index-out-of-bounds in drivers/net/wireless/ath/ath9k/htc_hst.c:26:51
>   index 255 is out of range for type 'htc_endpoint [22]'
>   CPU: 0 UID: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.11.0-rc6-dirty #14
>   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
>   Workqueue: events request_firmware_work_func
>   Call Trace:
>    <TASK>
>    dump_stack_lvl+0x180/0x1b0
>    __ubsan_handle_out_of_bounds+0xd4/0x130
>    htc_issue_send.constprop.0+0x20c/0x230
>    ? _raw_spin_unlock_irqrestore+0x3c/0x70
>    ath9k_wmi_cmd+0x41d/0x610
>    ? mark_held_locks+0x9f/0xe0
>    ...
>
> Since this bug has been confirmed to be caused by insufficient verification 
> of conn_rsp_epid, I think it would be appropriate to add a range check for 
> conn_rsp_epid to htc_connect_service() to prevent the bug from occurring.
>
> Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.")
> Signed-off-by: Jeongjun Park <aha310510@xxxxxxxxx>

Acked-by: Toke Høiland-Jørgensen <toke@xxxxxxx>