linux-hardening - Re: [PATCH][next] wifi: wil6210: Avoid -Wflex-array-member-not-at-end warning

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Date: Wed, 27 Mar 2024 13:02:19 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Kalle Valo <kvalo@...nel.org>
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] wifi: wil6210: Avoid -Wflex-array-member-not-at-end
 warning

Hi all,

Please, drop this.

The following patch replaces it:

https://lore.kernel.org/linux-hardening/ZgRsn72WkHzfCUsa@neat/

Thanks
--
Gustavo

On 3/26/24 20:29, Gustavo A. R. Silva wrote:
> Use the `DEFINE_FLEX()` helper for an on-stack definition of
> a flexible structure where the size of the flexible-array member
> is known at compile-time, and refactor the rest of the code,
> accordingly.
> 
> So, with these changes, fix the following warning:
> drivers/net/wireless/ath/wil6210/wmi.c:4018:49: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> Link: https://github.com/KSPP/linux/issues/202
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>   drivers/net/wireless/ath/wil6210/wmi.c | 19 +++++++------------
>   1 file changed, 7 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/wil6210/wmi.c b/drivers/net/wireless/ath/wil6210/wmi.c
> index 6fdb77d4c59e..cc0ad70f0d01 100644
> --- a/drivers/net/wireless/ath/wil6210/wmi.c
> +++ b/drivers/net/wireless/ath/wil6210/wmi.c
> @@ -4014,28 +4014,23 @@ int wmi_set_cqm_rssi_config(struct wil6210_priv *wil,
>   	struct net_device *ndev = wil->main_ndev;
>   	struct wil6210_vif *vif = ndev_to_vif(ndev);
>   	int rc;
> -	struct {
> -		struct wmi_set_link_monitor_cmd cmd;
> -		s8 rssi_thold;
> -	} __packed cmd = {
> -		.cmd = {
> -			.rssi_hyst = rssi_hyst,
> -			.rssi_thresholds_list_size = 1,
> -		},
> -		.rssi_thold = rssi_thold,
> -	};
>   	struct {
>   		struct wmi_cmd_hdr hdr;
>   		struct wmi_set_link_monitor_event evt;
>   	} __packed reply = {
>   		.evt = {.status = WMI_FW_STATUS_FAILURE},
>   	};
> +	DEFINE_FLEX(struct wmi_set_link_monitor_cmd, cmd,
> +		    rssi_thresholds_list, rssi_thresholds_list_size, 1);
> +
> +	cmd->rssi_hyst = rssi_hyst;
> +	cmd->rssi_thresholds_list[0] = rssi_thold;
>   
>   	if (rssi_thold > S8_MAX || rssi_thold < S8_MIN || rssi_hyst > U8_MAX)
>   		return -EINVAL;
>   
> -	rc = wmi_call(wil, WMI_SET_LINK_MONITOR_CMDID, vif->mid, &cmd,
> -		      sizeof(cmd), WMI_SET_LINK_MONITOR_EVENTID,
> +	rc = wmi_call(wil, WMI_SET_LINK_MONITOR_CMDID, vif->mid, cmd,
> +		      sizeof(*cmd), WMI_SET_LINK_MONITOR_EVENTID,
>   		      &reply, sizeof(reply), WIL_WMI_CALL_GENERAL_TO_MS);
>   	if (rc) {
>   		wil_err(wil, "WMI_SET_LINK_MONITOR_CMDID failed, rc %d\n", rc);