linux-kernel - [PATCH 1/2] firewire: core: check for missing struct update at build time, not run time

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Date:	Fri, 22 May 2009 23:16:27 +0200 (CEST)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
cc:	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kay Sievers <kay.sievers@...y.org>
Subject: [PATCH 1/2] firewire: core: check for missing struct update at build
 time, not run time

struct fw_attribute_group.attrs.[] must have enough room for all
attributes.  This can and should be checked at build time.

Our previous check at run time was a little late and not reliable since
most of the time less than the available attributes are populated.

Furthermore, omit an increment of an index at its last usage.

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
 drivers/firewire/fw-device.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

Index: linux/drivers/firewire/fw-device.c
===================================================================
--- linux.orig/drivers/firewire/fw-device.c
+++ linux/drivers/firewire/fw-device.c
@@ -289,14 +289,13 @@ static void init_fw_attribute_group(stru
 		attr = &config_rom_attributes[i].attr;
 		if (attr->show(dev, attr, NULL) < 0)
 			continue;
 		group->attrs[j++] = &attr->attr;
 	}
 
-	BUG_ON(j >= ARRAY_SIZE(group->attrs));
-	group->attrs[j++] = NULL;
+	group->attrs[j] = NULL;
 	group->groups[0] = &group->group;
 	group->groups[1] = NULL;
 	group->group.attrs = group->attrs;
 	dev->groups = group->groups;
 }
 
@@ -570,9 +569,13 @@ static void create_units(struct fw_devic
 		unit->device.parent = &device->device;
 		dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
 
+		BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
+				ARRAY_SIZE(fw_unit_attributes) +
+				ARRAY_SIZE(config_rom_attributes));
 		init_fw_attribute_group(&unit->device,
 					fw_unit_attributes,
 					&unit->attribute_group);
+
 		if (device_register(&unit->device) < 0)
 			goto skip_unit;
 
@@ -849,9 +852,13 @@ static void fw_device_init(struct work_s
 	device->device.devt = MKDEV(fw_cdev_major, minor);
 	dev_set_name(&device->device, "fw%d", minor);
 
+	BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
+			ARRAY_SIZE(fw_device_attributes) +
+			ARRAY_SIZE(config_rom_attributes));
 	init_fw_attribute_group(&device->device,
 				fw_device_attributes,
 				&device->attribute_group);
+
 	if (device_add(&device->device)) {
 		fw_error("Failed to add device.\n");
 		goto error_with_cdev;

-- 
Stefan Richter
-=====-==--= -=-= =-==-
http://arcgraph.de/sr/

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