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Date: Wed, 5 Mar 2008 23:24:43 +0300
From: Cyrill Gorcunov <gorcunov@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: mchehab@...radead.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] V4L1 - fix v4l_compat_translate_ioctl possible NULL deref
There are possible NULL pointer derefs in case of kzalloc fails so fix them.
Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
---
v4l1 is deprecated now and scheduled for removal *BUT* at December of 2008 only.
Index: linux-2.6.git/drivers/media/video/v4l1-compat.c
===================================================================
--- linux-2.6.git.orig/drivers/media/video/v4l1-compat.c 2008-01-21 19:35:14.000000000 +0300
+++ linux-2.6.git/drivers/media/video/v4l1-compat.c 2008-03-05 23:20:50.000000000 +0300
@@ -303,7 +303,11 @@ v4l_compat_translate_ioctl(struct inode
{
struct video_capability *cap = arg;
- cap2 = kzalloc(sizeof(*cap2),GFP_KERNEL);
+ cap2 = kzalloc(sizeof(*cap2), GFP_KERNEL);
+ if (!cap2) {
+ err = -ENOMEM;
+ break;
+ }
memset(cap, 0, sizeof(*cap));
memset(&fbuf2, 0, sizeof(fbuf2));
@@ -426,7 +430,11 @@ v4l_compat_translate_ioctl(struct inode
{
struct video_window *win = arg;
- fmt2 = kzalloc(sizeof(*fmt2),GFP_KERNEL);
+ fmt2 = kzalloc(sizeof(*fmt2), GFP_KERNEL);
+ if (!fmt2) {
+ err = -ENOMEM;
+ break;
+ }
memset(win,0,sizeof(*win));
fmt2->type = V4L2_BUF_TYPE_VIDEO_OVERLAY;
@@ -464,7 +472,11 @@ v4l_compat_translate_ioctl(struct inode
struct video_window *win = arg;
int err1,err2;
- fmt2 = kzalloc(sizeof(*fmt2),GFP_KERNEL);
+ fmt2 = kzalloc(sizeof(*fmt2), GFP_KERNEL);
+ if (!fmt2) {
+ err = -ENOMEM;
+ break;
+ }
fmt2->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
drv(inode, file, VIDIOC_STREAMOFF, &fmt2->type);
err1 = drv(inode, file, VIDIOC_G_FMT, fmt2);
@@ -586,6 +598,12 @@ v4l_compat_translate_ioctl(struct inode
{
struct video_picture *pict = arg;
+ fmt2 = kzalloc(sizeof(*fmt2), GFP_KERNEL);
+ if (!fmt2) {
+ err = -ENOMEM;
+ break;
+ }
+
pict->brightness = get_v4l_control(inode, file,
V4L2_CID_BRIGHTNESS,drv);
pict->hue = get_v4l_control(inode, file,
@@ -597,7 +615,6 @@ v4l_compat_translate_ioctl(struct inode
pict->whiteness = get_v4l_control(inode, file,
V4L2_CID_WHITENESS, drv);
- fmt2 = kzalloc(sizeof(*fmt2),GFP_KERNEL);
fmt2->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
err = drv(inode, file, VIDIOC_G_FMT, fmt2);
if (err < 0) {
@@ -617,6 +634,11 @@ v4l_compat_translate_ioctl(struct inode
struct video_picture *pict = arg;
int mem_err = 0, ovl_err = 0;
+ fmt2 = kzalloc(sizeof(*fmt2), GFP_KERNEL);
+ if (!fmt2) {
+ err = -ENOMEM;
+ break;
+ }
memset(&fbuf2, 0, sizeof(fbuf2));
set_v4l_control(inode, file,
@@ -636,7 +658,6 @@ v4l_compat_translate_ioctl(struct inode
* different pixel formats for memory vs overlay.
*/
- fmt2 = kzalloc(sizeof(*fmt2),GFP_KERNEL);
fmt2->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
err = drv(inode, file, VIDIOC_G_FMT, fmt2);
/* If VIDIOC_G_FMT failed, then the driver likely doesn't
@@ -890,7 +911,11 @@ v4l_compat_translate_ioctl(struct inode
{
struct video_mmap *mm = arg;
- fmt2 = kzalloc(sizeof(*fmt2),GFP_KERNEL);
+ fmt2 = kzalloc(sizeof(*fmt2), GFP_KERNEL);
+ if (!fmt2) {
+ err = -ENOMEM;
+ break;
+ }
memset(&buf2,0,sizeof(buf2));
fmt2->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@@ -986,7 +1011,11 @@ v4l_compat_translate_ioctl(struct inode
{
struct vbi_format *fmt = arg;
- fmt2 = kzalloc(sizeof(*fmt2),GFP_KERNEL);
+ fmt2 = kzalloc(sizeof(*fmt2), GFP_KERNEL);
+ if (!fmt2) {
+ err = -ENOMEM;
+ break;
+ }
fmt2->type = V4L2_BUF_TYPE_VBI_CAPTURE;
err = drv(inode, file, VIDIOC_G_FMT, fmt2);
@@ -1018,8 +1047,11 @@ v4l_compat_translate_ioctl(struct inode
break;
}
- fmt2 = kzalloc(sizeof(*fmt2),GFP_KERNEL);
-
+ fmt2 = kzalloc(sizeof(*fmt2), GFP_KERNEL);
+ if (!fmt2) {
+ err = -ENOMEM;
+ break;
+ }
fmt2->type = V4L2_BUF_TYPE_VBI_CAPTURE;
fmt2->fmt.vbi.samples_per_line = fmt->samples_per_line;
fmt2->fmt.vbi.sampling_rate = fmt->sampling_rate;
--
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