[PATCH 1/44] Fix hid-core for devices with #usages < #values

[Vojtech Pavlik <vojtech@suse.cz>]

You can pull this changeset from:
	bk://kernel.bkbits.net/vojtech/input

===================================================================

ChangeSet@1.1474.188.1, 2004-01-26 13:15:32+01:00, jamesl@appliedminds.com
  input: Fix hid-core for devices that have less usages than values
         in a hid report. We could iterate beyond the end of array of
         usages before.


 hid-core.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

===================================================================

diff -Nru a/drivers/usb/input/hid-core.c b/drivers/usb/input/hid-core.c
--- a/drivers/usb/input/hid-core.c	Tue Mar 16 13:20:15 2004
+++ b/drivers/usb/input/hid-core.c	Tue Mar 16 13:20:15 2004
@@ -224,6 +224,9 @@
 	offset = report->size;
 	report->size += parser->global.report_size * parser->global.report_count;
 
+	if (usages < parser->global.report_count)
+		usages = parser->global.report_count;
+
 	if (usages == 0)
 		return 0; /* ignore padding fields */
 
@@ -235,9 +238,13 @@
 	field->application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION);
 
 	for (i = 0; i < usages; i++) {
-		field->usage[i].hid = parser->local.usage[i];
+		int j = i;
+		/* Duplicate the last usage we parsed if we have excess values */
+		if (i >= parser->local.usage_index)
+			j = parser->local.usage_index - 1;
+		field->usage[i].hid = parser->local.usage[j];
 		field->usage[i].collection_index =
-			parser->local.collection_index[i];
+			parser->local.collection_index[j];
 	}
 
 	field->maxusage = usages;