V4L/DVB (4070): Zoran strncpy() fix

The zoran driver uses strncpy() in an unsafe way.  This patch uses the proper
sizeof()-1 size parameter.  Since all strncpy() targets are initialised with
memset() the trailing '\0' is already set.  Where std->name was the target for
the strncpy() we overwrote 8 Bytes of the std structure with zeros.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 13 insertions, 13 deletions

diff --git a/drivers/media/video/zoran_driver.c b/drivers/media/video/zoran_driver.c
index fd05a7fc4922..9711f6248ef7 100644
--- a/drivers/media/video/zoran_driver.c
+++ b/drivers/media/video/zoran_driver.c
@@ -2048,7 +2048,7 @@ zoran_do_ioctl (struct inode *inode,
                 dprintk(3, KERN_DEBUG "%s: VIDIOCGCAP\n", ZR_DEVNAME(zr));
 
                 memset(vcap, 0, sizeof(struct video_capability));
-                strncpy(vcap->name, ZR_DEVNAME(zr), sizeof(vcap->name));
+                strncpy(vcap->name, ZR_DEVNAME(zr), sizeof(vcap->name)-1);
                 vcap->type = ZORAN_VID_TYPE;
 
                 vcap->channels = zr->card.inputs;
@@ -2690,8 +2690,8 @@ zoran_do_ioctl (struct inode *inode,
                 dprintk(3, KERN_DEBUG "%s: VIDIOC_QUERYCAP\n", ZR_DEVNAME(zr));
 
                 memset(cap, 0, sizeof(*cap));
-                strncpy(cap->card, ZR_DEVNAME(zr), sizeof(cap->card));
-                strncpy(cap->driver, "zoran", sizeof(cap->driver));
+                strncpy(cap->card, ZR_DEVNAME(zr), sizeof(cap->card)-1);
+                strncpy(cap->driver, "zoran", sizeof(cap->driver)-1);
                 snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s",
                          pci_name(zr->pci_dev));
                 cap->version =
@@ -2743,7 +2743,7 @@ zoran_do_ioctl (struct inode *inode,
                 memset(fmt, 0, sizeof(*fmt));
                 fmt->index = index;
                 fmt->type = type;
-                strncpy(fmt->description, zoran_formats[i].name, 31);
+                strncpy(fmt->description, zoran_formats[i].name, sizeof(fmt->description)-1);
                 fmt->pixelformat = zoran_formats[i].fourcc;
                 if (zoran_formats[i].flags & ZORAN_FORMAT_COMPRESSED)
                         fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
@@ -3567,16 +3567,16 @@ zoran_do_ioctl (struct inode *inode,
 
                 switch (ctrl->id) {
                 case V4L2_CID_BRIGHTNESS:
-                        strncpy(ctrl->name, "Brightness", 31);
+                        strncpy(ctrl->name, "Brightness", sizeof(ctrl->name)-1);
                         break;
                 case V4L2_CID_CONTRAST:
-                        strncpy(ctrl->name, "Contrast", 31);
+                        strncpy(ctrl->name, "Contrast", sizeof(ctrl->name)-1);
                         break;
                 case V4L2_CID_SATURATION:
-                        strncpy(ctrl->name, "Saturation", 31);
+                        strncpy(ctrl->name, "Saturation", sizeof(ctrl->name)-1);
                         break;
                 case V4L2_CID_HUE:
-                        strncpy(ctrl->name, "Hue", 31);
+                        strncpy(ctrl->name, "Hue", sizeof(ctrl->name)-1);
                         break;
                 }
 
@@ -3694,7 +3694,7 @@ zoran_do_ioctl (struct inode *inode,
                                         &caps);
                         if (caps.flags & VIDEO_DECODER_AUTO) {
                                 std->id = V4L2_STD_ALL;
-                                strncpy(std->name, "Autodetect", 31);
+                                strncpy(std->name, "Autodetect", sizeof(std->name)-1);
                                 return 0;
                         } else
                                 return -EINVAL;
@@ -3702,21 +3702,21 @@ zoran_do_ioctl (struct inode *inode,
                 switch (std->index) {
                 case 0:
                         std->id = V4L2_STD_PAL;
-                        strncpy(std->name, "PAL", 31);
+                        strncpy(std->name, "PAL", sizeof(std->name)-1);
                         std->frameperiod.numerator = 1;
                         std->frameperiod.denominator = 25;
                         std->framelines = zr->card.tvn[0]->Ht;
                         break;
                 case 1:
                         std->id = V4L2_STD_NTSC;
-                        strncpy(std->name, "NTSC", 31);
+                        strncpy(std->name, "NTSC", sizeof(std->name)-1);
                         std->frameperiod.numerator = 1001;
                         std->frameperiod.denominator = 30000;
                         std->framelines = zr->card.tvn[1]->Ht;
                         break;
                 case 2:
                         std->id = V4L2_STD_SECAM;
-                        strncpy(std->name, "SECAM", 31);
+                        strncpy(std->name, "SECAM", sizeof(std->name)-1);
                         std->frameperiod.numerator = 1;
                         std->frameperiod.denominator = 25;
                         std->framelines = zr->card.tvn[2]->Ht;
@@ -3872,7 +3872,7 @@ zoran_do_ioctl (struct inode *inode,
                 memset(outp, 0, sizeof(*outp));
                 outp->index = 0;
                 outp->type = V4L2_OUTPUT_TYPE_ANALOGVGAOVERLAY;
-                strncpy(outp->name, "Autodetect", 31);
+                strncpy(outp->name, "Autodetect", sizeof(outp->name)-1);
 
                 return 0;
         }