linux-kernel - [PATCH v2 3/5] staging: rtl8188eu: fix potential leak in rtw_mp

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Message-ID: <20140507213230.1d0aaae7@spike>
Date:	Wed, 7 May 2014 21:32:30 +0200
From:	Christian Engelmayer <cengelma@....at>
To:	Christian Engelmayer <cengelma@....at>
Cc:	devel@...verdev.osuosl.org, w-lkml@...enslange-mailadresse.de,
	gregkh@...uxfoundation.org, peter.p.waskiewicz.jr@...el.com,
	oat.elena@...il.com, linux-kernel@...r.kernel.org,
	teobaluta@...il.com, dan.carpenter@...cle.com,
	Larry.Finger@...inger.net
Subject: [PATCH v2 3/5] staging: rtl8188eu: fix potential leak in
 rtw_mp_QueryDrv()

Function rtw_mp_QueryDrv() dynamically allocates a temporary buffer that
is not freed in all error paths. Use a centralized exit path and make sure
that all memory is freed correctly. Detected by Coverity - CID 1077713.

Signed-off-by: Christian Engelmayer <cengelma@....at>
---
 drivers/staging/rtl8188eu/os_dep/ioctl_linux.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c b/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c
index 1bd476d..8b1579b 100644
--- a/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c
@@ -7350,12 +7350,15 @@ static int rtw_mp_QueryDrv(struct net_device *dev,
 	char	*input = kmalloc(wrqu->data.length, GFP_KERNEL);
 	u8 qAutoLoad = 1;
 	struct eeprom_priv *pEEPROM = GET_EEPROM_EFUSE_PRIV(padapter);
+	int ret = 0;
 
 	if (!input)
 		return -ENOMEM;
 
-	if (copy_from_user(input, wrqu->data.pointer, wrqu->data.length))
-			return -EFAULT;
+	if (copy_from_user(input, wrqu->data.pointer, wrqu->data.length)) {
+		ret = -EFAULT;
+		goto exit;
+	}
 	DBG_88E("%s:iwpriv in =%s\n", __func__, input);
 
 	qAutoLoad = strncmp(input, "autoload", 8); /*  strncmp true is 0 */
@@ -7369,8 +7372,10 @@ static int rtw_mp_QueryDrv(struct net_device *dev,
 		sprintf(extra, "ok");
 	}
 	wrqu->data.length = strlen(extra) + 1;
+
+exit:
 	kfree(input);
-	return 0;
+	return ret;
 }
 
 static int rtw_mp_set(struct net_device *dev,
-- 
1.9.1

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