From: Jiri Kosina <jkosina@suse.cz>
Date: Wed, 21 Feb 2007 16:18:03 +0000 (+0100)
Subject: HID: fix possible double-free on error path in hid parser
X-Git-Tag: v2.6.21-rc3~147^2~3
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=776c0e96edecf77f827a62d2a1641cc2ca479043;p=linux-2.6

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@suse.cz>
---

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index aeeb6798e2..f4ee1afe48 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -667,7 +667,6 @@ struct hid_device *hid_parse_report(__u8 *start, unsigned size)
 
 		if (item.format != HID_ITEM_FORMAT_SHORT) {
 			dbg("unexpected long global item");
-			kfree(device->collection);
 			hid_free_device(device);
 			kfree(parser);
 			return NULL;
@@ -676,7 +675,6 @@ struct hid_device *hid_parse_report(__u8 *start, unsigned size)
 		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;
@@ -685,14 +683,12 @@ struct hid_device *hid_parse_report(__u8 *start, unsigned size)
 		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;
@@ -703,7 +699,6 @@ struct hid_device *hid_parse_report(__u8 *start, unsigned size)
 	}
 
 	dbg("item fetching failed at offset %d\n", (int)(end - start));
-	kfree(device->collection);
 	hid_free_device(device);
 	kfree(parser);
 	return NULL;