diff options
| author | Will McVicker <willmcvicker@google.com> | 2020-12-05 03:48:48 +0300 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2021-01-18 11:09:57 +0300 |
| commit | ed9be64eefe26d7d8b0b5b9fa3ffdf425d87a01f (patch) | |
| tree | 69719f3d0c6436c8d4a21e506872dede9374f5be /drivers/hid | |
| parent | a0312af1f94d13800e63a7d0a66e563582e39aec (diff) | |
| download | linux-ed9be64eefe26d7d8b0b5b9fa3ffdf425d87a01f.tar.xz | |
HID: make arrays usage and value to be the same
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>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-core.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 4d0faf77c14b..097cb1ee3126 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); if (!field) return NULL; @@ -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; |