Bug#916721: graphicsmagick: CVE-2018-20184

[Hugo Lefeuvre]

Hi,

upstream patch contains unrelated code refactoring (deduplication of the
_TargaInfo structure). I have trimmed it down so it contains only necessary
changes, you can find the modified patch in attachement (it's only a few
lines long).

cheers,

Hugo

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                Hugo Lefeuvre (hle)    |    www.owl.eu.com
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Subject: WriteTGAImage(): reject image rows/columns larger than 65535
Author: Bob Friesenhahn <bfrie...@graphicsmagick.org>, Hugo Lefeuvre <h...@debian.org>
Origin: http://hg.graphicsmagick.org/hg/GraphicsMagick/rev/15d1b5fd003b
Bug: https://sourceforge.net/p/graphicsmagick/bugs/583/
--- a/coders/tga.c	2018-12-26 14:54:50.250695800 +0100
+++ b/coders/tga.c	2018-12-26 14:54:50.250695800 +0100
@@ -949,6 +949,10 @@
           targa_info.colormap_length=(unsigned short) image->colors;
           targa_info.colormap_size=24;
         }
+
+      if ((image->columns > 65535) || (image->rows > 65535))
+        ThrowWriterException(CoderError,ImageColumnOrRowSizeIsNotSupported, image);
+
       /*
         Write TGA header.
       */

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