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HID: fix oops in gyration_event()

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commit d8e4ebf8b6 upstream.

Fix oops caused by dereferencing field->hidinput in cases where
the device hasn't been claimed by hid-input.

Reported-by: Andreas Demmer <mail@andreas-demmer.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jiri Kosina
2010-03-23 16:32:37 +01:00
committed by Greg Kroah-Hartman
parent 4e44a79800
commit 6e313203f4
1 changed files with 4 additions and 1 deletions
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5
drivers/hid/hid-gyration.c
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@@ -53,10 +53,13 @@ static int gyration_input_mapping(struct hid_device *hdev, struct hid_input *hi,
static int gyration_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct input_dev *input = field->hidinput->input;
if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
return 0;
if ((usage->hid & HID_USAGE_PAGE) == HID_UP_GENDESK &&
(usage->hid & 0xff) == 0x82) {
struct input_dev *input = field->hidinput->input;
input_event(input, usage->type, usage->code, 1);
input_sync(input);
input_event(input, usage->type, usage->code, 0);