From a246b4d547708f33ff4d4b9a7a5dbac741dc89d8 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Fri, 3 Jan 2020 17:35:11 +0100 Subject: [PATCH] media: xirlink_cit: add missing descriptor sanity checks 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 check in cit_get_packet_size() is not redundant as the driver is mixing looking up altsettings by index and by number, which may not coincide. Fixes: 659fefa0eb17 ("V4L/DVB: gspca_xirlink_cit: Add support for camera with a bcd version of 0.01") Fixes: 59f8b0bf3c12 ("V4L/DVB: gspca_xirlink_cit: support bandwidth changing for devices with 1 alt setting") Cc: stable # 2.6.37 Cc: Hans de Goede Signed-off-by: Johan Hovold Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/gspca/xirlink_cit.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/gspca/xirlink_cit.c b/drivers/media/usb/gspca/xirlink_cit.c index 934a90bd78c2..c579b100f066 100644 --- a/drivers/media/usb/gspca/xirlink_cit.c +++ b/drivers/media/usb/gspca/xirlink_cit.c @@ -1442,6 +1442,9 @@ static int cit_get_packet_size(struct gspca_dev *gspca_dev) return -EIO; } + if (alt->desc.bNumEndpoints < 1) + return -ENODEV; + return le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); } @@ -2626,6 +2629,7 @@ static int sd_start(struct gspca_dev *gspca_dev) static int sd_isoc_init(struct gspca_dev *gspca_dev) { + struct usb_interface_cache *intfc; struct usb_host_interface *alt; int max_packet_size; @@ -2641,8 +2645,17 @@ static int sd_isoc_init(struct gspca_dev *gspca_dev) break; } + 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(max_packet_size); return 0; @@ -2665,6 +2678,9 @@ static int sd_isoc_nego(struct gspca_dev *gspca_dev) break; } + /* + * Existence of altsetting and endpoint was verified in sd_isoc_init() + */ alt = &gspca_dev->dev->actconfig->intf_cache[0]->altsetting[1]; packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); if (packet_size <= min_packet_size) -- 2.11.0