From: Michał Mirosław mirq-linux@rere.qmqm.pl
commit b3a81c777dcb093020680490ab970d85e2f6f04f upstream.
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: stable@vger.kernel.org Fixes: 8c3d52fc393b ("HID: make parser more verbose about parsing errors by default") Signed-off-by: Michał Mirosław mirq-linux@rere.qmqm.pl Signed-off-by: Jiri Kosina jkosina@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/hid/hid-core.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -975,6 +975,7 @@ int hid_open_report(struct hid_device *d __u8 *start; __u8 *buf; __u8 *end; + __u8 *next; int ret; static int (*dispatch_type[])(struct hid_parser *parser, struct hid_item *item) = { @@ -1028,7 +1029,8 @@ int hid_open_report(struct hid_device *d 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"); @@ -1058,7 +1060,8 @@ int hid_open_report(struct hid_device *d } }
- hid_err(device, "item fetching failed at offset %d\n", (int)(end - start)); + hid_err(device, "item fetching failed at offset %u/%u\n", + size - (unsigned int)(end - start), size); err: kfree(parser->collection_stack); alloc_err: