Great! Thanks for the reply.
--Will
On Thu, Dec 17, 2020 at 2:19 AM Jiri Kosina jikos@kernel.org wrote:
On Mon, 14 Dec 2020, Will McVicker wrote:
The HID subsystem allows an "HID report field" to have a different number of "values" and "usages" when it is allocated. When a field struct is created, the size of the usage array is guaranteed to be at least as large as the values array, but it may be larger. This leads to a potential out-of-bounds write in __hidinput_change_resolution_multipliers() and an out-of-bounds read in hidinput_count_leds().
To fix this, let's make sure that both the usage and value arrays are the same size.
Signed-off-by: Will McVicker willmcvicker@google.com
drivers/hid/hid-core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 56172fe6995c..8a8b2b982f83 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -90,7 +90,7 @@ EXPORT_SYMBOL_GPL(hid_register_report);
- Register a new field for this report.
*/
-static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages, unsigned values) +static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages) { struct hid_field *field;
@@ -101,7 +101,7 @@ static struct hid_field *hid_register_field(struct hid_report *report, unsigned
field = kzalloc((sizeof(struct hid_field) + usages * sizeof(struct hid_usage) +
values * sizeof(unsigned)), GFP_KERNEL);
usages * sizeof(unsigned)), GFP_KERNEL);@@ -300,7 +300,7 @@ static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsign usages = max_t(unsigned, parser->local.usage_index, parser->global.report_count);
- field = hid_register_field(report, usages, parser->global.report_count);
- field = hid_register_field(report, usages); if (!field) return 0;
-- 2.29.2.576.ga3fc446d84-goog
Hi Jiri and Benjamin,
This is a friendly reminder in case this got lost in your inbox.
Hi Will,
I am planning to merge it once the merge window is over.
-- Jiri Kosina SUSE Labs