linux-kernel - [PATCH v2] staging: vt6656: fix potential leak in vt6656_hostap

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Date:	Wed, 7 May 2014 21:43:37 +0200
From:	Christian Engelmayer <cengelma@....at>
To:	devel@...verdev.osuosl.org
Cc:	gregkh@...uxfoundation.org, peter.senna@...il.com,
	linux-kernel@...r.kernel.org, forest@...ttletooquiet.net,
	dan.carpenter@...cle.com
Subject: [PATCH v2] staging: vt6656: fix potential leak in
 vt6656_hostap_ioctl()

Commit fb841d67 (staging: vt6656: don't leak 'param' in vt6656_hostap_ioctl()
when returning -EOPNOTSUPP) cleaned up direct returns in the ioctl switch
statement that leaked already allocated memory. Fix the same issue for
VIAWGET_HOSTAPD_SCAN_REQ and VIAWGET_HOSTAPD_MLME that are not supported by
this driver. Detected by Coverity - CID 144381.

Signed-off-by: Christian Engelmayer <cengelma@....at>
---
v2: Resend after v1 failed to apply

   * rebased against staging-next - commit 09c3fbba (staging: rtl8188eu:
     Remove 'u8 *pbuf' from struct recv_buf)
   * fixed mua: no multipart, 7bit text/plain us-ascii

Compile tested and applies against branch staging-next of tree
git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
---
 drivers/staging/vt6656/hostap.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/vt6656/hostap.c b/drivers/staging/vt6656/hostap.c
index 67ba48b..a0d9fff 100644
--- a/drivers/staging/vt6656/hostap.c
+++ b/drivers/staging/vt6656/hostap.c
@@ -742,7 +742,8 @@ int vt6656_hostap_ioctl(struct vnt_private *pDevice, struct iw_point *p)
 
 	case VIAWGET_HOSTAPD_MLME:
 	    DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "VIAWGET_HOSTAPD_MLME \n");
-	    return -EOPNOTSUPP;
+	    ret = -EOPNOTSUPP;
+	    goto out;
 
 	case VIAWGET_HOSTAPD_SET_GENERIC_ELEMENT:
 	    DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "VIAWGET_HOSTAPD_SET_GENERIC_ELEMENT \n");
@@ -751,7 +752,8 @@ int vt6656_hostap_ioctl(struct vnt_private *pDevice, struct iw_point *p)
 
 	case VIAWGET_HOSTAPD_SCAN_REQ:
 	    DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "VIAWGET_HOSTAPD_SCAN_REQ \n");
-	    return -EOPNOTSUPP;
+	    ret = -EOPNOTSUPP;
+	    goto out;
 
 	case VIAWGET_HOSTAPD_STA_CLEAR_STATS:
 	    DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "VIAWGET_HOSTAPD_STA_CLEAR_STATS \n");
-- 
1.9.1

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