| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 102/164] [media] dib0700: fix NULL-deref at probe | Date | Tue, 23 May 2017 22:08:39 +0200 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold <johan@kernel.org>
commit d5823511c0f8719a39e72ede1bce65411ac653b7 upstream.
Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints.
Fixes: c4018fa2e4c0 ("[media] dib0700: fix RC support on Hauppauge Nova-TD")
Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/media/usb/dvb-usb/dib0700_core.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/media/usb/dvb-usb/dib0700_core.c +++ b/drivers/media/usb/dvb-usb/dib0700_core.c @@ -812,6 +812,9 @@ int dib0700_rc_setup(struct dvb_usb_devi /* Starting in firmware 1.20, the RC info is provided on a bulk pipe */ + if (intf->altsetting[0].desc.bNumEndpoints < rc_ep + 1) + return -ENODEV; + purb = usb_alloc_urb(0, GFP_KERNEL); if (purb == NULL) return -ENOMEM;
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