| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 255/271] Input: pegasus_notetaker - fix endpoint sanity check | Date | Tue, 28 Jan 2020 15:06:44 +0100 |
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From: Johan Hovold <johan@kernel.org>
commit bcfcb7f9b480dd0be8f0df2df17340ca92a03b98 upstream.
The driver was checking the number of endpoints of the first alternate setting instead of the current one, something which could be used by a malicious device (or USB descriptor fuzzer) to trigger a NULL-pointer dereference.
Fixes: 1afca2b66aac ("Input: add Pegasus Notetaker tablet driver") Signed-off-by: Johan Hovold <johan@kernel.org> Acked-by: Martin Kepplinger <martink@posteo.de> Acked-by: Vladis Dronov <vdronov@redhat.com> Link: https://lore.kernel.org/r/20191210113737.4016-2-johan@kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/input/tablet/pegasus_notetaker.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/input/tablet/pegasus_notetaker.c +++ b/drivers/input/tablet/pegasus_notetaker.c @@ -260,7 +260,7 @@ static int pegasus_probe(struct usb_inte return -ENODEV; /* Sanity check that the device has an endpoint */ - if (intf->altsetting[0].desc.bNumEndpoints < 1) { + if (intf->cur_altsetting->desc.bNumEndpoints < 1) { dev_err(&intf->dev, "Invalid number of endpoints\n"); return -EINVAL; }
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