From: Johan Hovold johan@kernel.org
commit 485b06aadb933190f4bc44e006076bc27a23f205 upstream.
Make sure to check that we have two alternate settings and at least one endpoint before accessing the second altsetting structure and dereferencing the endpoint arrays.
This specifically avoids dereferencing NULL-pointers or corrupting memory when a device does not have the expected descriptors.
Note that the sanity checks in stv06xx_start() and pb0100_start() are not redundant as the driver is mixing looking up altsettings by index and by number, which may not coincide.
Fixes: 8668d504d72c ("V4L/DVB (12082): gspca_stv06xx: Add support for st6422 bridge and sensor") Fixes: c0b33bdc5b8d ("[media] gspca-stv06xx: support bandwidth changing") Cc: stable stable@vger.kernel.org # 2.6.31 Cc: Hans de Goede hdegoede@redhat.com Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/media/usb/gspca/stv06xx/stv06xx.c | 19 ++++++++++++++++++- drivers/media/usb/gspca/stv06xx/stv06xx_pb0100.c | 4 ++++ 2 files changed, 22 insertions(+), 1 deletion(-)
--- a/drivers/media/usb/gspca/stv06xx/stv06xx.c +++ b/drivers/media/usb/gspca/stv06xx/stv06xx.c @@ -282,6 +282,9 @@ static int stv06xx_start(struct gspca_de return -EIO; }
+ if (alt->desc.bNumEndpoints < 1) + return -ENODEV; + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); err = stv06xx_write_bridge(sd, STV_ISO_SIZE_L, packet_size); if (err < 0) @@ -306,11 +309,21 @@ out:
static int stv06xx_isoc_init(struct gspca_dev *gspca_dev) { + struct usb_interface_cache *intfc; struct usb_host_interface *alt; struct sd *sd = (struct sd *) gspca_dev;
+ intfc = gspca_dev->dev->actconfig->intf_cache[0]; + + if (intfc->num_altsetting < 2) + return -ENODEV; + + alt = &intfc->altsetting[1]; + + if (alt->desc.bNumEndpoints < 1) + return -ENODEV; + /* Start isoc bandwidth "negotiation" at max isoc bandwidth */ - alt = &gspca_dev->dev->actconfig->intf_cache[0]->altsetting[1]; alt->endpoint[0].desc.wMaxPacketSize = cpu_to_le16(sd->sensor->max_packet_size[gspca_dev->curr_mode]);
@@ -323,6 +336,10 @@ static int stv06xx_isoc_nego(struct gspc struct usb_host_interface *alt; struct sd *sd = (struct sd *) gspca_dev;
+ /* + * Existence of altsetting and endpoint was verified in + * stv06xx_isoc_init() + */ alt = &gspca_dev->dev->actconfig->intf_cache[0]->altsetting[1]; packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); min_packet_size = sd->sensor->min_packet_size[gspca_dev->curr_mode]; --- a/drivers/media/usb/gspca/stv06xx/stv06xx_pb0100.c +++ b/drivers/media/usb/gspca/stv06xx/stv06xx_pb0100.c @@ -185,6 +185,10 @@ static int pb0100_start(struct sd *sd) alt = usb_altnum_to_altsetting(intf, sd->gspca_dev.alt); if (!alt) return -ENODEV; + + if (alt->desc.bNumEndpoints < 1) + return -ENODEV; + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize);
/* If we don't have enough bandwidth use a lower framerate */