From: Mathias Krause <minipli@googlemail.com>
Date: Wed, 15 Aug 2012 11:31:49 +0000 (+0000)
Subject: Bluetooth: RFCOMM - Fix info leak in ioctl(RFCOMMGETDEVLIST)
X-Git-Tag: firefly_0821_release~7541^2~717
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=416a675770e625f4f5ccef3ce70b560abc94757a;p=firefly-linux-kernel-4.4.55.git

Bluetooth: RFCOMM - Fix info leak in ioctl(RFCOMMGETDEVLIST)

[ Upstream commit f9432c5ec8b1e9a09b9b0e5569e3c73db8de432a ]

The RFCOMM code fails to initialize the two padding bytes of struct
rfcomm_dev_list_req inserted for alignment before copying it to
userland. Additionally there are two padding bytes in each instance of
struct rfcomm_dev_info. The ioctl() that for disclosures two bytes plus
dev_num times two bytes uninitialized kernel heap memory.

Allocate the memory using kzalloc() to fix this issue.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index c258796313e0..bc1eb56cf5a8 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -471,7 +471,7 @@ static int rfcomm_get_dev_list(void __user *arg)
 
 	size = sizeof(*dl) + dev_num * sizeof(*di);
 
-	dl = kmalloc(size, GFP_KERNEL);
+	dl = kzalloc(size, GFP_KERNEL);
 	if (!dl)
 		return -ENOMEM;