[patch 063/101] HID: fix possible double-free on error path in hid parser

[Greg KH]

From: Jiri Kosina <jkosina@xxxxxxx>

HID: fix possible double-free on error path in hid parser

Freeing of device->collection is properly done in hid_free_device() (as
this function is supposed to free all the device resources and could be
called from transport specific code, e.g. usb_hid_configure()).

Remove all kfree() calls preceeding the hid_free_device() call.

Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/hid/hid-core.c |    5 -----
 1 file changed, 5 deletions(-)

--- linux-2.6.20.1.orig/drivers/hid/hid-core.c
+++ linux-2.6.20.1/drivers/hid/hid-core.c
@@ -670,7 +670,6 @@ struct hid_device *hid_parse_report(__u8
 
 		if (item.format != HID_ITEM_FORMAT_SHORT) {
 			dbg("unexpected long global item");
-			kfree(device->collection);
 			hid_free_device(device);
 			kfree(parser);
 			return NULL;
@@ -679,7 +678,6 @@ struct hid_device *hid_parse_report(__u8
 		if (dispatch_type[item.type](parser, &item)) {
 			dbg("item %u %u %u %u parsing failed\n",
 				item.format, (unsigned)item.size, (unsigned)item.type, (unsigned)item.tag);
-			kfree(device->collection);
 			hid_free_device(device);
 			kfree(parser);
 			return NULL;
@@ -688,14 +686,12 @@ struct hid_device *hid_parse_report(__u8
 		if (start == end) {
 			if (parser->collection_stack_ptr) {
 				dbg("unbalanced collection at end of report description");
-				kfree(device->collection);
 				hid_free_device(device);
 				kfree(parser);
 				return NULL;
 			}
 			if (parser->local.delimiter_depth) {
 				dbg("unbalanced delimiter at end of report description");
-				kfree(device->collection);
 				hid_free_device(device);
 				kfree(parser);
 				return NULL;
@@ -706,7 +702,6 @@ struct hid_device *hid_parse_report(__u8
 	}
 
 	dbg("item fetching failed at offset %d\n", (int)(end - start));
-	kfree(device->collection);
 	hid_free_device(device);
 	kfree(parser);
 	return NULL;

--
-
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