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HID: fix error message in hid_open_report()

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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>
This commit is contained in:
Michał Mirosław 2019-08-23 21:15:27 +02:00 committed by prashantpaddune
parent bec992edca
commit 4cf77fd5a3
1 changed files with 5 additions and 2 deletions
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7
drivers/hid/hid-core.c
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@ -959,6 +959,7 @@ 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) = {
@ -1012,7 +1013,8 @@ 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");
@ -1041,7 +1043,8 @@ 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 %u/%u\n",
size - (unsigned int)(end - start), size);
err:
vfree(parser);
hid_close_report(device);