linux-kernel - Re: [PATCH] staging: rtl8723au: fix potential leak in update_bcn_wps

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Date:	Thu, 1 May 2014 22:16:31 +0200
From:	Christian Engelmayer <cengelma@....at>
To:	Mateusz Guzik <mguzik@...hat.com>
Cc:	devel@...verdev.osuosl.org, Larry.Finger@...inger.net,
	Jes.Sorensen@...hat.com, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8723au: fix potential leak in
 update_bcn_wps_ie()

On Thu, 1 May 2014 14:22:17 +0200, Mateusz Guzik <mguzik@...hat.com> wrote:
> On Thu, May 01, 2014 at 01:57:27PM +0200, Christian Engelmayer wrote:
> > Fix a potential leak in the error path of function update_bcn_wps_ie().
> > Make sure that allocated memory for 'pbackup_remainder_ie' is freed
> > upon return. Detected by Coverity - CID 1077718.
> > 
> 
>         if (remainder_ielen > 0) {
>                 pbackup_remainder_ie = kmalloc(remainder_ielen, GFP_ATOMIC);
>                 if (pbackup_remainder_ie)
>                         memcpy(pbackup_remainder_ie, premainder_ie,
>                                remainder_ielen);
>         }
> 
>         pwps_ie_src = pmlmepriv->wps_beacon_ie;
>         if (pwps_ie_src == NULL)
>                 return;
> 
> 
> Maybe just check pwps_ie_src earlier?
> 

You are right, I see no reason why this cannot be done early in the function.


diff --git a/drivers/staging/rtl8723au/core/rtw_ap.c b/drivers/staging/rtl8723au/core/rtw_ap.c
index 9b31412..da028c535 100644
--- a/drivers/staging/rtl8723au/core/rtw_ap.c
+++ b/drivers/staging/rtl8723au/core/rtw_ap.c
@@ -1256,6 +1256,10 @@ static void update_bcn_wps_ie(struct rtw_adapter *padapter)
 
 	DBG_8723A("%s\n", __func__);
 
+	pwps_ie_src = pmlmepriv->wps_beacon_ie;
+	if (pwps_ie_src == NULL)
+		return;
+
 	pwps_ie = rtw_get_wps_ie23a(ie+_FIXED_IE_LENGTH_, ielen-_FIXED_IE_LENGTH_, NULL, &wps_ielen);
 
 	if (pwps_ie == NULL || wps_ielen == 0)
@@ -1274,10 +1278,6 @@ static void update_bcn_wps_ie(struct rtw_adapter *padapter)
 			       remainder_ielen);
 	}
 
-	pwps_ie_src = pmlmepriv->wps_beacon_ie;
-	if (pwps_ie_src == NULL)
-		return;
-
 	wps_ielen = (uint)pwps_ie_src[1];/* to get ie data len */
 	if ((wps_offset+wps_ielen+2+remainder_ielen)<= MAX_IE_SZ)
 	{


Regards,
Christian

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