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52 lines
2.0 KiB
Diff
52 lines
2.0 KiB
Diff
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From 90eb3c037fe3f0f25f01713a92725a8daa2b41f3 Mon Sep 17 00:00:00 2001
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From: Vladis Dronov <vdronov@redhat.com>
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Date: Tue, 1 Dec 2015 13:09:17 -0800
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Subject: Input: aiptek - fix crash on detecting device without endpoints
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commit 8e20cf2bce122ce9262d6034ee5d5b76fbb92f96 upstream.
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The aiptek driver crashes in aiptek_probe() when a specially crafted USB
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device without endpoints is detected. This fix adds a check that the device
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has proper configuration expected by the driver. Also an error return value
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is changed to more matching one in one of the error paths.
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Reported-by: Ralf Spenneberg <ralf@spenneberg.net>
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Signed-off-by: Vladis Dronov <vdronov@redhat.com>
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Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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[bwh: Backported to 3.2: adjust context]
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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drivers/input/tablet/aiptek.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/drivers/input/tablet/aiptek.c b/drivers/input/tablet/aiptek.c
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index 6d89fd1..5657018 100644
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--- a/drivers/input/tablet/aiptek.c
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+++ b/drivers/input/tablet/aiptek.c
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@@ -1810,6 +1810,14 @@ aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
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input_set_abs_params(inputdev, ABS_TILT_Y, AIPTEK_TILT_MIN, AIPTEK_TILT_MAX, 0, 0);
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input_set_abs_params(inputdev, ABS_WHEEL, AIPTEK_WHEEL_MIN, AIPTEK_WHEEL_MAX - 1, 0, 0);
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+ /* Verify that a device really has an endpoint */
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+ if (intf->altsetting[0].desc.bNumEndpoints < 1) {
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+ dev_err(&intf->dev,
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+ "interface has %d endpoints, but must have minimum 1\n",
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+ intf->altsetting[0].desc.bNumEndpoints);
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+ err = -EINVAL;
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+ goto fail3;
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+ }
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endpoint = &intf->altsetting[0].endpoint[0].desc;
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/* Go set up our URB, which is called when the tablet receives
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@@ -1852,6 +1860,7 @@ aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
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if (i == ARRAY_SIZE(speeds)) {
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dev_info(&intf->dev,
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"Aiptek tried all speeds, no sane response\n");
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+ err = -EINVAL;
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goto fail2;
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}
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--
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cgit v1.1
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