Commit 50220dea authored by Benjamin Tissoires's avatar Benjamin Tissoires Committed by Jiri Kosina

HID: core: prevent out-of-bound readings

Plugging a Logitech DJ receiver with KASAN activated raises a bunch of
out-of-bound readings.

The fields are allocated up to MAX_USAGE, meaning that potentially, we do
not have enough fields to fit the incoming values.
Add checks and silence KASAN.
Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 5137b354
...@@ -1293,6 +1293,7 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field, ...@@ -1293,6 +1293,7 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field,
/* Ignore report if ErrorRollOver */ /* Ignore report if ErrorRollOver */
if (!(field->flags & HID_MAIN_ITEM_VARIABLE) && if (!(field->flags & HID_MAIN_ITEM_VARIABLE) &&
value[n] >= min && value[n] <= max && value[n] >= min && value[n] <= max &&
value[n] - min < field->maxusage &&
field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1) field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1)
goto exit; goto exit;
} }
...@@ -1305,11 +1306,13 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field, ...@@ -1305,11 +1306,13 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field,
} }
if (field->value[n] >= min && field->value[n] <= max if (field->value[n] >= min && field->value[n] <= max
&& field->value[n] - min < field->maxusage
&& field->usage[field->value[n] - min].hid && field->usage[field->value[n] - min].hid
&& search(value, field->value[n], count)) && search(value, field->value[n], count))
hid_process_event(hid, field, &field->usage[field->value[n] - min], 0, interrupt); hid_process_event(hid, field, &field->usage[field->value[n] - min], 0, interrupt);
if (value[n] >= min && value[n] <= max if (value[n] >= min && value[n] <= max
&& value[n] - min < field->maxusage
&& field->usage[value[n] - min].hid && field->usage[value[n] - min].hid
&& search(field->value, value[n], count)) && search(field->value, value[n], count))
hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt); hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt);
......
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