V4L/DVB (13378): konicawc.c: possible buffer overflow while use strncat
authorAlexander Strakh <strakh@ispras.ru>
Tue, 17 Nov 2009 22:43:37 +0000 (19:43 -0300)
committerMauro Carvalho Chehab <mchehab@redhat.com>
Sat, 5 Dec 2009 20:41:35 +0000 (18:41 -0200)
commitcaac970f91f39f67b5e48680840605e24896ff99
tree74a82f2ab094660ae9ae999974590714f41bd70a
parent38a54f35a0a90c0b62b111dd4de24248b22616b9
V4L/DVB (13378): konicawc.c: possible buffer overflow while use strncat

In driver ./drivers/media/video/usbvideo/konicawc.c in line 227:

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

After this line we use strncat:

228         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>
drivers/media/video/usbvideo/konicawc.c