| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 082/164] [media] usbvision: fix NULL-deref at probe | Date | Tue, 23 May 2017 22:08:19 +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 eacb975b48272f54532b62f515a3cf7eefa35123 upstream.
Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer or accessing memory beyond the endpoint array should a malicious device lack the expected endpoints.
Fixes: 2a9f8b5d25be ("V4L/DVB (5206): Usbvision: set alternate interface modification")
Cc: Thierry MERLE <thierry.merle@free.fr> 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/usbvision/usbvision-video.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/media/usb/usbvision/usbvision-video.c +++ b/drivers/media/usb/usbvision/usbvision-video.c @@ -1506,7 +1506,14 @@ static int usbvision_probe(struct usb_in } for (i = 0; i < usbvision->num_alt; i++) { - u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc. + u16 tmp; + + if (uif->altsetting[i].desc.bNumEndpoints < 2) { + ret = -ENODEV; + goto err_pkt; + } + + tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc. wMaxPacketSize); usbvision->alt_max_pkt_size[i] = (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
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