linux/drivers/media
Alexander Strakh 2b588db82d V4L/DVB (13379): quickcam_messenger: possible buffer overflow while use strncat
In driver ./drivers/media/video/usbvideo/quickcam_messenger.c in line 91:

  91         usb_make_path(dev, cam->input_physname, sizeof(cam->input_physname));

After this line we use strncat:

  92         strncat(cam->input_physname, "/input0", sizeof(cam->input_physname));

where sizeof(cam->input_physname) returns length of cam->input_phisname
without length for null-symbol.  But this parameter must be - "maximum
numbers of bytes to copy", i.e.:
sizeof(cam->input_physname)-strlen(cam->input_physname)-1.

In this case, after call to usb_make_path the similar drivers use strlcat.

Like in: drivers/hid/usbhid/hid-core.c:
1152         usb_make_path(dev, hid->phys, sizeof(hid->phys));
1153         strlcat(hid->phys, "/input", sizeof(hid->phys));

Found by Linux Driver Verification Project.

Use strlcat instead of strncat.

Signed-off-by: Alexander Strakh <strakh@ispras.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-12-05 18:41:36 -02:00
..
common V4L/DVB (13373): Maxium MAX2165 silicon tuner 2009-12-05 18:41:33 -02:00
dvb V4L/DVB (13376): cx-usb: add Mygica D689 DMB-TH USB support 2009-12-05 18:41:35 -02:00
radio V4L/DVB (13177): radio: Add support for TEF6862 tuner 2009-12-05 18:40:43 -02:00
video V4L/DVB (13379): quickcam_messenger: possible buffer overflow while use strncat 2009-12-05 18:41:36 -02:00
Kconfig V4L/DVB (11881): one kconfig controls them all 2009-06-16 18:21:16 -03:00
Makefile V4L/DVB (8274): sms1xxx: build cleanup after driver relocation 2008-07-20 07:20:56 -03:00