From: Alexander Strakh <strakh@ispras.ru>
Date: Tue, 17 Nov 2009 22:43:37 +0000 (-0300)
Subject: V4L/DVB (13378): konicawc.c: possible buffer overflow while use strncat
X-Git-Tag: firefly_0821_release~9833^2~3918^2~117
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=caac970f91f39f67b5e48680840605e24896ff99;p=firefly-linux-kernel-4.4.55.git
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>
---
diff --git a/drivers/media/video/usbvideo/konicawc.c b/drivers/media/video/usbvideo/konicawc.c
index 31d57f2d09e1..a0addcb04295 100644
--- a/drivers/media/video/usbvideo/konicawc.c
+++ b/drivers/media/video/usbvideo/konicawc.c
@@ -225,7 +225,7 @@ static void konicawc_register_input(struct konicawc *cam, struct usb_device *dev
int error;
usb_make_path(dev, cam->input_physname, sizeof(cam->input_physname));
- strncat(cam->input_physname, "/input0", sizeof(cam->input_physname));
+ strlcat(cam->input_physname, "/input0", sizeof(cam->input_physname));
cam->input = input_dev = input_allocate_device();
if (!input_dev) {