linux-kernel - [PATCH 3.12 002/116] libertas: potential oops in debugfs

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Message-Id: <20131127005737.088380136@linuxfoundation.org>
Date:	Tue, 26 Nov 2013 16:56:15 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Nico Golde <nico@...lde.de>,
	Fabian Yamaguchi <fabs@...sec.de>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Dan Williams <dcbw@...hat.com>,
	"John W. Linville" <linville@...driver.com>,
	Kees Cook <keescook@...omium.org>
Subject: [PATCH 3.12 002/116] libertas: potential oops in debugfs

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit a497e47d4aec37aaf8f13509f3ef3d1f6a717d88 upstream.

If we do a zero size allocation then it will oops.  Also we can't be
sure the user passes us a NUL terminated string so I've added a
terminator.

This code 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>
Acked-by: Dan Williams <dcbw@...hat.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Cc: Kees Cook <keescook@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/libertas/debugfs.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/libertas/debugfs.c
+++ b/drivers/net/wireless/libertas/debugfs.c
@@ -913,7 +913,10 @@ static ssize_t lbs_debugfs_write(struct
 	char *p2;
 	struct debug_data *d = f->private_data;
 
-	pdata = kmalloc(cnt, GFP_KERNEL);
+	if (cnt == 0)
+		return 0;
+
+	pdata = kmalloc(cnt + 1, GFP_KERNEL);
 	if (pdata == NULL)
 		return 0;
 
@@ -922,6 +925,7 @@ static ssize_t lbs_debugfs_write(struct
 		kfree(pdata);
 		return 0;
 	}
+	pdata[cnt] = '\0';
 
 	p0 = pdata;
 	for (i = 0; i < num_of_items; i++) {


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