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-rw-r--r--drivers/media/video/v4l2-ioctl.c107
1 files changed, 52 insertions, 55 deletions
diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index 175688e9489f..00c0f76b9b5d 100644
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -726,16 +726,8 @@ static long __video_do_ioctl(struct file *file,
case VIDIOC_ENUM_FMT:
{
struct v4l2_fmtdesc *f = arg;
- enum v4l2_buf_type type;
- unsigned int index;
- index = f->index;
- type = f->type;
- memset(f, 0, sizeof(*f));
- f->index = index;
- f->type = type;
-
- switch (type) {
+ switch (f->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (ops->vidioc_enum_fmt_vid_cap)
ret = ops->vidioc_enum_fmt_vid_cap(file, fh, f);
@@ -772,8 +764,6 @@ static long __video_do_ioctl(struct file *file,
{
struct v4l2_format *f = (struct v4l2_format *)arg;
- memset(f->fmt.raw_data, 0, sizeof(f->fmt.raw_data));
-
/* FIXME: Should be one dump per type */
dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
@@ -969,11 +959,6 @@ static long __video_do_ioctl(struct file *file,
if (ret)
break;
- /* Zero out all fields starting with bytesysed, which is
- * everything but index and type. */
- memset(0, &p->bytesused,
- sizeof(*p) - offsetof(typeof(*p), bytesused));
-
ret = ops->vidioc_querybuf(file, fh, p);
if (!ret)
dbgbuf(cmd, vfd, p);
@@ -1159,12 +1144,9 @@ static long __video_do_ioctl(struct file *file,
case VIDIOC_ENUMINPUT:
{
struct v4l2_input *p = arg;
- int i = p->index;
if (!ops->vidioc_enum_input)
break;
- memset(p, 0, sizeof(*p));
- p->index = i;
ret = ops->vidioc_enum_input(file, fh, p);
if (!ret)
@@ -1203,12 +1185,9 @@ static long __video_do_ioctl(struct file *file,
case VIDIOC_ENUMOUTPUT:
{
struct v4l2_output *p = arg;
- int i = p->index;
if (!ops->vidioc_enum_output)
break;
- memset(p, 0, sizeof(*p));
- p->index = i;
ret = ops->vidioc_enum_output(file, fh, p);
if (!ret)
@@ -1384,13 +1363,11 @@ static long __video_do_ioctl(struct file *file,
case VIDIOC_G_AUDIO:
{
struct v4l2_audio *p = arg;
- __u32 index = p->index;
if (!ops->vidioc_g_audio)
break;
memset(p, 0, sizeof(*p));
- p->index = index;
ret = ops->vidioc_g_audio(file, fh, p);
if (!ret)
dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
@@ -1485,15 +1462,10 @@ static long __video_do_ioctl(struct file *file,
case VIDIOC_G_CROP:
{
struct v4l2_crop *p = arg;
- __u32 type;
if (!ops->vidioc_g_crop)
break;
- type = p->type;
- memset(p, 0, sizeof(*p));
- p->type = type;
-
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
ret = ops->vidioc_g_crop(file, fh, p);
if (!ret)
@@ -1514,16 +1486,11 @@ static long __video_do_ioctl(struct file *file,
case VIDIOC_CROPCAP:
{
struct v4l2_cropcap *p = arg;
- __u32 type;
/*FIXME: Should also show v4l2_fract pixelaspect */
if (!ops->vidioc_cropcap)
break;
- type = p->type;
- memset(p, 0, sizeof(*p));
- p->type = type;
-
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
ret = ops->vidioc_cropcap(file, fh, p);
if (!ret) {
@@ -1581,7 +1548,6 @@ static long __video_do_ioctl(struct file *file,
if (!ops->vidioc_encoder_cmd)
break;
- memset(&p->raw, 0, sizeof(p->raw));
ret = ops->vidioc_encoder_cmd(file, fh, p);
if (!ret)
dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
@@ -1593,7 +1559,6 @@ static long __video_do_ioctl(struct file *file,
if (!ops->vidioc_try_encoder_cmd)
break;
- memset(&p->raw, 0, sizeof(p->raw));
ret = ops->vidioc_try_encoder_cmd(file, fh, p);
if (!ret)
dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
@@ -1602,10 +1567,6 @@ static long __video_do_ioctl(struct file *file,
case VIDIOC_G_PARM:
{
struct v4l2_streamparm *p = arg;
- __u32 type = p->type;
-
- memset(p, 0, sizeof(*p));
- p->type = type;
if (ops->vidioc_g_parm) {
ret = ops->vidioc_g_parm(file, fh, p);
@@ -1638,14 +1599,10 @@ static long __video_do_ioctl(struct file *file,
case VIDIOC_G_TUNER:
{
struct v4l2_tuner *p = arg;
- __u32 index = p->index;
if (!ops->vidioc_g_tuner)
break;
- memset(p, 0, sizeof(*p));
- p->index = index;
-
ret = ops->vidioc_g_tuner(file, fh, p);
if (!ret)
dbgarg(cmd, "index=%d, name=%s, type=%d, "
@@ -1682,8 +1639,6 @@ static long __video_do_ioctl(struct file *file,
if (!ops->vidioc_g_frequency)
break;
- memset(p->reserved, 0, sizeof(p->reserved));
-
ret = ops->vidioc_g_frequency(file, fh, p);
if (!ret)
dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
@@ -1704,12 +1659,13 @@ static long __video_do_ioctl(struct file *file,
case VIDIOC_G_SLICED_VBI_CAP:
{
struct v4l2_sliced_vbi_cap *p = arg;
- __u32 type = p->type;
if (!ops->vidioc_g_sliced_vbi_cap)
break;
- memset(p, 0, sizeof(*p));
- p->type = type;
+
+ /* Clear up to type, everything after type is zerod already */
+ memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));
+
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
ret = ops->vidioc_g_sliced_vbi_cap(file, fh, p);
if (!ret)
@@ -1782,8 +1738,6 @@ static long __video_do_ioctl(struct file *file,
if (!ops->vidioc_enum_framesizes)
break;
- memset(p, 0, sizeof(*p));
-
ret = ops->vidioc_enum_framesizes(file, fh, p);
dbgarg(cmd,
"index=%d, pixelformat=%d, type=%d ",
@@ -1815,8 +1769,6 @@ static long __video_do_ioctl(struct file *file,
if (!ops->vidioc_enum_frameintervals)
break;
- memset(p, 0, sizeof(*p));
-
ret = ops->vidioc_enum_frameintervals(file, fh, p);
dbgarg(cmd,
"index=%d, pixelformat=%d, width=%d, height=%d, type=%d ",
@@ -1865,6 +1817,44 @@ static long __video_do_ioctl(struct file *file,
return ret;
}
+/* In some cases, only a few fields are used as input, i.e. when the app sets
+ * "index" and then the driver fills in the rest of the structure for the thing
+ * with that index. We only need to copy up the first non-input field. */
+static unsigned long cmd_input_size(unsigned int cmd)
+{
+ /* Size of structure up to and including 'field' */
+#define CMDINSIZE(cmd, type, field) case _IOC_NR(VIDIOC_##cmd): return \
+ offsetof(struct v4l2_##type, field) + \
+ sizeof(((struct v4l2_##type *)0)->field);
+
+ switch (_IOC_NR(cmd)) {
+ CMDINSIZE(ENUM_FMT, fmtdesc, type);
+ CMDINSIZE(G_FMT, format, type);
+ CMDINSIZE(QUERYBUF, buffer, type);
+ CMDINSIZE(G_PARM, streamparm, type);
+ CMDINSIZE(ENUMSTD, standard, index);
+ CMDINSIZE(ENUMINPUT, input, index);
+ CMDINSIZE(G_CTRL, control, id);
+ CMDINSIZE(G_TUNER, tuner, index);
+ CMDINSIZE(QUERYCTRL, queryctrl, id);
+ CMDINSIZE(QUERYMENU, querymenu, index);
+ CMDINSIZE(ENUMOUTPUT, output, index);
+ CMDINSIZE(G_MODULATOR, modulator, index);
+ CMDINSIZE(G_FREQUENCY, frequency, tuner);
+ CMDINSIZE(CROPCAP, cropcap, type);
+ CMDINSIZE(G_CROP, crop, type);
+ CMDINSIZE(ENUMAUDIO, audio, index);
+ CMDINSIZE(ENUMAUDOUT, audioout, index);
+ CMDINSIZE(ENCODER_CMD, encoder_cmd, flags);
+ CMDINSIZE(TRY_ENCODER_CMD, encoder_cmd, flags);
+ CMDINSIZE(G_SLICED_VBI_CAP, sliced_vbi_cap, type);
+ CMDINSIZE(ENUM_FRAMESIZES, frmsizeenum, pixel_format);
+ CMDINSIZE(ENUM_FRAMEINTERVALS, frmivalenum, height);
+ default:
+ return _IOC_SIZE(cmd);
+ }
+}
+
long video_ioctl2(struct file *file,
unsigned int cmd, unsigned long arg)
{
@@ -1901,9 +1891,16 @@ long video_ioctl2(struct file *file,
}
err = -EFAULT;
- if (_IOC_DIR(cmd) & _IOC_WRITE)
- if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
+ if (_IOC_DIR(cmd) & _IOC_WRITE) {
+ unsigned long n = cmd_input_size(cmd);
+
+ if (copy_from_user(parg, (void __user *)arg, n))
goto out;
+
+ /* zero out anything we don't copy from userspace */
+ if (n < _IOC_SIZE(cmd))
+ memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
+ }
break;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 05:23:12 +0100