A NULL pointer dereference in the function ReadPANGOImage in coders/pango.c and the function ReadVIDImage in coders/vid.c in ImageMagick 7.0.8-34 allows remote attackers to cause a denial of service via a crafted image.
### Prerequisites

- [ Y ] I have written a descriptive issue title
- [ Y ] I have verified that I am using the latest version of ImageMagick
- [ Y ] I have searched [open](https://github.com/ImageMagick/ImageMagick/issues) and [closed](https://github.com/ImageMagick/ImageMagick/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported

### Description
<!-- A description of the bug or feature -->
There is a null pointer deference vulnerablity in function ReadPANGOImage in coders/pango.c

```
  option=GetImageOption(image_info,"filename");
  if (option == (const char *) NULL)
    property=InterpretImageProperties((ImageInfo *) image_info,image,
      image_info->filename,exception);
  else
    if (LocaleNCompare(option,"pango:",6) == 0)
      property=InterpretImageProperties((ImageInfo *) image_info,image,option+6,
        exception);
    else
      property=InterpretImageProperties((ImageInfo *) image_info,image,option,
        exception);
  (void) SetImageProperty(image,"caption",property,exception);
```
(https://github.com/ImageMagick/ImageMagick/blob/master/coders/pango.c#L202)

The return value of InterpretImageProperties may be NULL, and then there is a null pointer deference.

See https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6152 and https://github.com/ImageMagick/ImageMagick/commit/93a9ccc85bd62b21bc4246fc6a8c2b7a32f8d678 for details.


Null pointer deference in function ReadPANGOImage in coders/pango.c
This is a GitHub Issue
repo:ImageMagick
owner:ImageMagick
Title : Null pointer deference in function ReadPANGOImage in coders/pango.c
Issue date:

--- start body ---
### Prerequisites

- [ Y ] I have written a descriptive issue title
- [ Y ] I have verified that I am using the latest version of ImageMagick
- [ Y ] I have searched [open](https://github.com/ImageMagick/ImageMagick/issues) and [closed](https://github.com/ImageMagick/ImageMagick/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported

### Description
<!-- A description of the bug or feature -->
There is a null pointer deference vulnerablity in function ReadPANGOImage in coders/pango.c

```
  option=GetImageOption(image_info,"filename");
  if (option == (const char *) NULL)
    property=InterpretImageProperties((ImageInfo *) image_info,image,
      image_info->filename,exception);
  else
    if (LocaleNCompare(option,"pango:",6) == 0)
      property=InterpretImageProperties((ImageInfo *) image_info,image,option+6,
        exception);
    else
      property=InterpretImageProperties((ImageInfo *) image_info,image,option,
        exception);
  (void) SetImageProperty(image,"caption",property,exception);
```
(https://github.com/ImageMagick/ImageMagick/blob/master/coders/pango.c#L202)

The return value of InterpretImageProperties may be NULL, and then there is a null pointer deference.

See https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6152 and https://github.com/ImageMagick/ImageMagick/commit/93a9ccc85bd62b21bc4246fc6a8c2b7a32f8d678 for details.


--- end body ---
