netdev - [PATCH] mac80211: Fix memory leak in ieee80211_if

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Message-ID: <1268237616.2880.34.camel@edumazet-laptop>
Date:	Wed, 10 Mar 2010 17:13:36 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>,
	Johannes Berg <johannes@...solutions.net>
Cc:	netdev <netdev@...r.kernel.org>, linux-wireless@...r.kernel.org
Subject: [PATCH] mac80211: Fix memory leak in ieee80211_if_write()

Fix memory leak and use kmalloc() instead of kzalloc() as we are going
to overwrite the allocated buffer.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
 net/mac80211/debugfs_netdev.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 9affe2c..a55e864 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -48,20 +48,24 @@ static ssize_t ieee80211_if_write(
 	ssize_t (*write)(struct ieee80211_sub_if_data *, const char *, int))
 {
 	u8 *buf;
-	ssize_t ret = -ENODEV;
+	ssize_t ret;
 
-	buf = kzalloc(count, GFP_KERNEL);
+	buf = kmalloc(count, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
 
+	ret = -EFAULT;
 	if (copy_from_user(buf, userbuf, count))
-		return -EFAULT;
+		goto freebuf;
 
+	ret = -ENODEV;
 	rtnl_lock();
 	if (sdata->dev->reg_state == NETREG_REGISTERED)
 		ret = (*write)(sdata, buf, count);
 	rtnl_unlock();
 
+freebuf:
+	kfree(buf);	
 	return ret;
 }
 


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