diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2019-10-03 14:53:59 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-06 12:18:20 +0100 |
| commit | 7b5e3ad5d582e252d971ee599a3f63f30b70ccb1 (patch) | |
| tree | f250d6be0ea61e2f99df3f6fd7662f26c2fdbd79 /drivers/hid/hid-sony.c | |
| parent | 81198e60c2985d8a0222cc1e163a7fe6cc7cf97b (diff) | |
HID: Fix assumption that devices have inputs
commit d9d4b1e46d9543a82c23f6df03f4ad697dab361b upstream.
The syzbot fuzzer found a slab-out-of-bounds write bug in the hid-gaff
driver. The problem is caused by the driver's assumption that the
device must have an input report. While this will be true for all
normal HID input devices, a suitably malicious device can violate the
assumption.
The same assumption is present in over a dozen other HID drivers.
This patch fixes them by checking that the list of hid_inputs for the
hid_device is nonempty before allowing it to be used.
Reported-and-tested-by: syzbot+403741a091bf41d4ae79@syzkaller.appspotmail.com
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: <stable@vger.kernel.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hid/hid-sony.c')
| -rw-r--r-- | drivers/hid/hid-sony.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c index eee58d15e745..9633d7a7ac2e 100644 --- a/drivers/hid/hid-sony.c +++ b/drivers/hid/hid-sony.c @@ -2008,9 +2008,15 @@ static int sony_play_effect(struct input_dev *dev, void *data, static int sony_init_ff(struct sony_sc *sc) { - struct hid_input *hidinput = list_entry(sc->hdev->inputs.next, - struct hid_input, list); - struct input_dev *input_dev = hidinput->input; + struct hid_input *hidinput; + struct input_dev *input_dev; + + if (list_empty(&sc->hdev->inputs)) { + hid_err(sc->hdev, "no inputs found\n"); + return -ENODEV; + } + hidinput = list_entry(sc->hdev->inputs.next, struct hid_input, list); + input_dev = hidinput->input; input_set_capability(input_dev, EV_FF, FF_RUMBLE); return input_ff_create_memless(input_dev, NULL, sony_play_effect); |