Commit 4ad69d5f authored by Prabhakar Lad's avatar Prabhakar Lad Committed by Greg Kroah-Hartman

media: platform: davinci: return -EINVAL for VPFE_CMD_S_CCDC_RAW_PARAMS ioctl

commit da05d52d upstream.

this patch makes sure VPFE_CMD_S_CCDC_RAW_PARAMS ioctl no longer works
for vpfe_capture driver with a minimal patch suitable for backporting.

- This ioctl was never in public api and was only defined in kernel header.
- The function set_params constantly mixes up pointers and phys_addr_t
  numbers.
- This is part of a 'VPFE_CMD_S_CCDC_RAW_PARAMS' ioctl command that is
  described as an 'experimental ioctl that will change in future kernels'.
- The code to allocate the table never gets called after we copy_from_user
  the user input over the kernel settings, and then compare them
  for inequality.
- We then go on to use an address provided by user space as both the
  __user pointer for input and pass it through phys_to_virt to come up
  with a kernel pointer to copy the data to. This looks like a trivially
  exploitable root hole.

Due to these reasons we make sure this ioctl now returns -EINVAL and backport
this patch as far as possible.

Fixes: 5f15fbb6 ("V4L/DVB (12251): v4l: dm644x ccdc module for vpfe capture driver")
Signed-off-by: default avatarLad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent df5ef7a0
......@@ -1706,27 +1706,9 @@ static long vpfe_param_handler(struct file *file, void *priv,
switch (cmd) {
case VPFE_CMD_S_CCDC_RAW_PARAMS:
v4l2_warn(&vpfe_dev->v4l2_dev,
"VPFE_CMD_S_CCDC_RAW_PARAMS: experimental ioctl\n");
if (ccdc_dev->hw_ops.set_params) {
ret = ccdc_dev->hw_ops.set_params(param);
if (ret) {
v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
"Error setting parameters in CCDC\n");
goto unlock_out;
}
ret = vpfe_get_ccdc_image_format(vpfe_dev,
&vpfe_dev->fmt);
if (ret < 0) {
v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
"Invalid image format at CCDC\n");
goto unlock_out;
}
} else {
ret = -EINVAL;
v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
v4l2_warn(&vpfe_dev->v4l2_dev,
"VPFE_CMD_S_CCDC_RAW_PARAMS not supported\n");
}
break;
default:
ret = -ENOTTY;
......
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