[PATCH RESEND] HID: fix error message in hid_open_report()

[Michał Mirosław]

On HID report descriptor parsing error the code displays bogus
pointer instead of error offset (subtracts start=NULL from end).
Make the message more useful by displaying correct error offset
and include total buffer size for reference.

This was carried over from ancient times - "Fixed" commit just
promoted the message from DEBUG to ERROR.

Cc: sta...@vger.kernel.org
Fixes: 8c3d52fc393b ("HID: make parser more verbose about parsing errors by 
default")
Signed-off-by: Michał Mirosław <mirq-li...@rere.qmqm.pl>

---
 * against v5.2.2

Signed-off-by: Michał Mirosław <mirq-li...@rere.qmqm.pl>
---
 drivers/hid/hid-core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 210b81a56e1a..bb74b7ff4e6a 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1139,6 +1139,7 @@ int hid_open_report(struct hid_device *device)
        __u8 *start;
        __u8 *buf;
        __u8 *end;
+       __u8 *next;
        int ret;
        static int (*dispatch_type[])(struct hid_parser *parser,
                                      struct hid_item *item) = {
@@ -1192,7 +1193,8 @@ int hid_open_report(struct hid_device *device)
        device->collection_size = HID_DEFAULT_NUM_COLLECTIONS;
 
        ret = -EINVAL;
-       while ((start = fetch_item(start, end, &item)) != NULL) {
+       while ((next = fetch_item(start, end, &item)) != NULL) {
+               start = next;
 
                if (item.format != HID_ITEM_FORMAT_SHORT) {
                        hid_err(device, "unexpected long global item\n");
@@ -1230,7 +1232,8 @@ int hid_open_report(struct hid_device *device)
                }
        }
 
-       hid_err(device, "item fetching failed at offset %d\n", (int)(end - 
start));
+       hid_err(device, "item fetching failed at offset %zu/%zu\n",
+               size - (end - start), size);
 err:
        kfree(parser->collection_stack);
 alloc_err:
-- 
2.20.1