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-Url: https://git.stricted.de/?a=commitdiff_plain;h=f9432c5ec8b1e9a09b9b0e5569e3c73db8de432a;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

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

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>
---

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index cb960773c00..56f182393c4 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -456,7 +456,7 @@ 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;