From 137d9ebfdbaa45c01f9f0f6d5121ae6f1eb942bd Mon Sep 17 00:00:00 2001
From: Stefan Richter <stefanr@s5r6.in-berlin.de>
Date: Fri, 19 Feb 2010 21:00:02 +0100
Subject: [PATCH] firewire: core: fix an information leak

If a device exposes a sparsely populated configuration ROM,
firewire-core's sysfs interface and character device file interface
showed random data in the gaps between config ROM blocks.  Fix this by
zero-initialization of the config ROM reader's scratch buffer.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
 drivers/firewire/core-device.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 150a8ba97488..f61211977d33 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -514,6 +514,7 @@ static int read_bus_info_block(struct fw_device *device, int generation)
 		return -ENOMEM;
 
 	stack = &rom[READ_BIB_ROM_SIZE];
+	memset(rom, 0, sizeof(*rom) * READ_BIB_ROM_SIZE);
 
 	device->max_speed = SCODE_100;
 
-- 
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