netdev - [patch] libertas: potential oops in debugfs

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Date:	Tue, 29 Oct 2013 22:06:41 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"John W. Linville" <linville@...driver.com>
Cc:	libertas-dev@...ts.infradead.org, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, security@...nel.org,
	Nico Golde <nico@...lde.de>, Fabian Yamaguchi <fabs@...sec.de>
Subject: [patch] libertas: potential oops in debugfs

If we do a zero size write then it will oops.  This can only be
triggered by root.

Reported-by: Nico Golde <nico@...lde.de>
Reported-by: Fabian Yamaguchi <fabs@...sec.de>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/net/wireless/libertas/debugfs.c b/drivers/net/wireless/libertas/debugfs.c
index 668dd27..a148f14 100644
--- a/drivers/net/wireless/libertas/debugfs.c
+++ b/drivers/net/wireless/libertas/debugfs.c
@@ -913,6 +913,9 @@ static ssize_t lbs_debugfs_write(struct file *f, const char __user *buf,
 	char *p2;
 	struct debug_data *d = f->private_data;
 
+	if (cnt == 0)
+		return 0;
+
 	pdata = kmalloc(cnt, GFP_KERNEL);
 	if (pdata == NULL)
 		return 0;
--
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