linux-kernel - Re: [PATCH] staging: r8188eu: replace rtw

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Message-ID: <20190910115932.GB15977@kadam>
Date:   Tue, 10 Sep 2019 14:59:32 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Ivan Safonov <insafonov@...il.com>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        devel@...verdev.osuosl.org,
        Robert Węcławski <r.weclawski@...il.com>,
        Florian Büstgens <flbue@....de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Nishka Dasgupta <nishkadg.linux@...il.com>
Subject: Re: [PATCH] staging: r8188eu: replace rtw_malloc() with it's
 definition

On Sun, Sep 08, 2019 at 12:00:26PM +0300, Ivan Safonov wrote:
> rtw_malloc prevents the use of kmemdup/kzalloc and others.
> 
> Signed-off-by: Ivan Safonov <insafonov@...il.com>
> ---
>  drivers/staging/rtl8188eu/core/rtw_ap.c        |  4 ++--
>  drivers/staging/rtl8188eu/core/rtw_mlme_ext.c  |  2 +-
>  .../staging/rtl8188eu/include/osdep_service.h  |  3 ---
>  drivers/staging/rtl8188eu/os_dep/ioctl_linux.c | 18 +++++++++---------
>  drivers/staging/rtl8188eu/os_dep/mlme_linux.c  |  2 +-
>  .../staging/rtl8188eu/os_dep/osdep_service.c   |  7 +------
>  6 files changed, 14 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/staging/rtl8188eu/core/rtw_ap.c b/drivers/staging/rtl8188eu/core/rtw_ap.c
> index 51a5b71f8c25..c9c57379b7a2 100644
> --- a/drivers/staging/rtl8188eu/core/rtw_ap.c
> +++ b/drivers/staging/rtl8188eu/core/rtw_ap.c
> @@ -104,7 +104,7 @@ static void update_BCNTIM(struct adapter *padapter)
>  	}
>  
>  	if (remainder_ielen > 0) {
> -		pbackup_remainder_ie = rtw_malloc(remainder_ielen);
> +		pbackup_remainder_ie = kmalloc(remainder_ielen, in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
                                                                ^^^^^^^^^^^^^
This stuff isn't right.  It really should be checking if spinlocks are
held or IRQs are disabled.  And the only way to do that is by auditing
the callers.

(The original rtw_malloc() implementation is buggy nonsense).

regards,
dan carpenter