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51 lines
1.9 KiB
51 lines
1.9 KiB
From 50220dead1650609206efe91f0cc116132d59b3f Mon Sep 17 00:00:00 2001
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From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Date: Tue, 19 Jan 2016 12:34:58 +0100
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Subject: [PATCH] HID: core: prevent out-of-bound readings
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Plugging a Logitech DJ receiver with KASAN activated raises a bunch of
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out-of-bound readings.
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The fields are allocated up to MAX_USAGE, meaning that potentially, we do
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not have enough fields to fit the incoming values.
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Add checks and silence KASAN.
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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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---
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drivers/hid/hid-core.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
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index 16c2c66..3f6ac5f 100644
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--- a/drivers/hid/hid-core.c
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+++ b/drivers/hid/hid-core.c
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@@ -1293,6 +1293,7 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field,
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/* Ignore report if ErrorRollOver */
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if (!(field->flags & HID_MAIN_ITEM_VARIABLE) &&
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value[n] >= min && value[n] <= max &&
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+ value[n] - min < field->maxusage &&
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field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1)
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goto exit;
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}
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@@ -1305,11 +1306,13 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field,
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}
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if (field->value[n] >= min && field->value[n] <= max
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+ && field->value[n] - min < field->maxusage
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&& field->usage[field->value[n] - min].hid
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&& search(value, field->value[n], count))
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hid_process_event(hid, field, &field->usage[field->value[n] - min], 0, interrupt);
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if (value[n] >= min && value[n] <= max
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+ && value[n] - min < field->maxusage
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&& field->usage[value[n] - min].hid
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&& search(field->value, value[n], count))
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hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt);
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--
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2.5.5
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