1 This patch comes from upstream:

     2 https://github.com/ImageMagick/ImageMagick/commit/dd84447b63a71fa8c3f47071b09454efc667767b

     3 It can be removed once we upgrade to a release that has the fix, presumably

     4 version 6.9.5-4 or later.

     5 

     6 --- ImageMagick-6.9.5/magick/property.c.orig	2016-06-26 17:40:19.000000000 -0700

     7 +++ ImageMagick-6.9.5/magick/property.c	2016-07-29 05:56:23.858967297 -0700

     8 @@ -638,6 +638,11 @@

     9      if ((count & 0x01) == 0)

    10        (void) ReadPropertyByte(&info,&length);

    11      count=(ssize_t) ReadPropertyMSBLong(&info,&length);

    12 +    if ((count < 0) || ((size_t) count > length))

    13 +      {

    14 +        length=0; 

    15 +        continue;

    16 +      }

    17      if ((*name != '\0') && (*name != '#'))

    18        if ((resource == (char *) NULL) || (LocaleCompare(name,resource) != 0))

    19          {