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HID: fix parsing of local delimiter with size 0

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Acording to HID standard 1.11, value 0 allows for size being 0.
Local delimiter tag has has 0 one of the possible values.

Therefore we need to handle this case properly, to be fully compliant
with the specification.

Reported-by: Marcin Tolysz <tolysz@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jiri Kosina 2010-01-05 11:45:52 +01:00
parent cf2f765f18
commit 722612cd51
1 changed files with 2 additions and 1 deletions
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3
drivers/hid/hid-core.c
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@ -387,7 +387,8 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
__u32 data;
unsigned n;
if (item->size == 0) {
/* Local delimiter could have value 0, which allows size to be 0 */
if (item->size == 0 && item->tag != HID_LOCAL_ITEM_TAG_DELIMITER) {
dbg_hid("item data expected for local item\n");
return -1;
}