linux-kernel - Re: [PATCH] staging: rtl8192e, rtl8192u: use correct notation to define pointer

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Message-ID: <20201027112303.GA405023@kroah.com>
Date:   Tue, 27 Oct 2020 12:23:03 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Muhammad Usama Anjum <musamaanjum@...il.com>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8192e, rtl8192u: use correct notation to
 define pointer

On Mon, Oct 26, 2020 at 05:14:35PM +0500, Muhammad Usama Anjum wrote:
> Use pointer notation instead of using array notation as info_element is
> a pointer not array.
> 
> Warnings from sparse:
> drivers/staging/rtl8192u/ieee80211/ieee80211.h:1013:51: warning: array of flexible structures
> drivers/staging/rtl8192u/ieee80211/ieee80211.h:985:51: warning: array of flexible structures
> drivers/staging/rtl8192u/ieee80211/ieee80211.h:963:51: warning: array of flexible structures
> drivers/staging/rtl8192u/ieee80211/ieee80211.h:996:51: warning: array of flexible structures
> drivers/staging/rtl8192u/ieee80211/ieee80211.h:974:51: warning: array of flexible structures
> 
> drivers/staging/rtl8192e/rtllib.h:832:48: warning: array of flexible structures
> drivers/staging/rtl8192e/rtllib.h:851:48: warning: array of flexible structures
> drivers/staging/rtl8192e/rtllib.h:805:48: warning: array of flexible structures
> drivers/staging/rtl8192e/rtllib.h:843:48: warning: array of flexible structures
> drivers/staging/rtl8192e/rtllib.h:821:48: warning: array of flexible structures
> 
> Signed-off-by: Muhammad Usama Anjum <musamaanjum@...il.com>
> ---
>  drivers/staging/rtl8192e/rtllib.h              | 10 +++++-----
>  drivers/staging/rtl8192u/ieee80211/ieee80211.h | 12 ++++++------
>  2 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/staging/rtl8192e/rtllib.h b/drivers/staging/rtl8192e/rtllib.h
> index b84f00b8d18b..1dab9c3d08a8 100644
> --- a/drivers/staging/rtl8192e/rtllib.h
> +++ b/drivers/staging/rtl8192e/rtllib.h
> @@ -802,7 +802,7 @@ struct rtllib_authentication {
>  	__le16 transaction;
>  	__le16 status;
>  	/*challenge*/
> -	struct rtllib_info_element info_element[];
> +	struct rtllib_info_element *info_element;
>  } __packed;

Are you sure these changes are correct?  This isn't just a list of
structures after this at the end of the structure?

Please look at commit 5979afa2c4d1 ("staging: Replace zero-length array
with flexible-array member") which made most of these flexible arrays.

This is not a pointer, it really is an array, I think sparse is really
wrong here, be careful.

thanks,

greg k-h