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HID: make arrays usage and value to be the same

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commit ed9be64eefe26d7d8b0b5b9fa3ffdf425d87a01f upstream.

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.

Cc: stable@vger.kernel.org
Signed-off-by: Will McVicker <willmcvicker@google.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Change-Id: I2dde02fea5a221d77bed8477d3d69f56749a1899
Issue: SEC-2935
(cherry picked from commit fcd3e187c1a2558a1081d819e12d52ed55cf15b7)
This commit is contained in:
Will McVicker
2021-10-10 23:46:48 +02:00
committed by Francescodario Cuzzocrea
parent 6a19ac3adc
commit 5064b71d09
1 changed files with 3 additions and 3 deletions
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drivers/hid/hid-core.c
+3 -3
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@@ -91,7 +91,7 @@ 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;
@@ -102,7 +102,7 @@ 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);
if (!field)
return NULL;
@@ -254,7 +254,7 @@ 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;