summaryrefslogtreecommitdiff
path: root/drivers/media/usb
diff options
context:
space:
mode:
authorJohan Hovold <johan@kernel.org>2017-03-13 15:53:55 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-05-25 16:44:39 +0300
commit736f41a47442c164e3cdc8d2a980d3155130163f (patch)
tree7ca7774d1dbcef28353008e9b12a262510fa51bb /drivers/media/usb
parenta3adb4721ae2af534b1adf74dfb7f54329fa448c (diff)
downloadlinux-736f41a47442c164e3cdc8d2a980d3155130163f.tar.xz
usbvision: fix NULL-deref at probe
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>
Diffstat (limited to 'drivers/media/usb')
-rw-r--r--drivers/media/usb/usbvision/usbvision-video.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/media/usb/usbvision/usbvision-video.c b/drivers/media/usb/usbvision/usbvision-video.c
index c8b4eb2ee7a2..bfdf72355332 100644
--- 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_interface *intf,
}
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);