From c4153f18bfdc1f7e88c1da8d6e495a55c8771a03 Mon Sep 17 00:00:00 2001
From: cristy <cristy@aa41f4f7-0bf4-0310-aa73-e5a19afd5a74>
Date: Fri, 19 Dec 2014 12:12:18 +0000
Subject: [PATCH] Fix crash due to corrupted dib file

git-svn-id: https://subversion.imagemagick.org/subversion/ImageMagick/branches/ImageMagick-6@17343 aa41f4f7-0bf4-0310-aa73-e5a19afd5a74
origin:  http://trac.imagemagick.org/changeset/17343
---
 coders/dib.c | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/coders/dib.c b/coders/dib.c
index afe6634..eb367cd 100644
--- a/coders/dib.c
+++ b/coders/dib.c
@@ -155,6 +155,10 @@ static MagickBooleanType DecodeImage(Image *image,
 #define BI_RLE8  1
 #define BI_RLE4  2
 #define BI_BITFIELDS  3
+#undef BI_JPEG
+#define BI_JPEG  4
+#undef BI_PNG
+#define BI_PNG  5
 #endif
 
   int
@@ -537,9 +541,42 @@ static Image *ReadDIBImage(const ImageInfo *image_info,ExceptionInfo *exception)
       dib_info.green_mask=ReadBlobLSBLong(image);
       dib_info.blue_mask=ReadBlobLSBLong(image);
     }
+  if (dib_info.width <= 0)
+    ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
+  if (dib_info.height == 0)
+    ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
+  if (dib_info.planes != 1)
+    ThrowReaderException(CorruptImageError,"StaticPlanesValueNotEqualToOne");
+  if ((dib_info.bits_per_pixel != 1) && (dib_info.bits_per_pixel != 4) &&
+      (dib_info.bits_per_pixel != 8) && (dib_info.bits_per_pixel != 16) &&
+      (dib_info.bits_per_pixel != 24) && (dib_info.bits_per_pixel != 32))
+    ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
+  if (dib_info.bits_per_pixel < 16 &&
+      dib_info.number_colors > (1U << dib_info.bits_per_pixel))
+    ThrowReaderException(CorruptImageError,"UnrecognizedNumberOfColors");
+  if ((dib_info.compression == 1) && (dib_info.bits_per_pixel != 8))
+    ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
+  if ((dib_info.compression == 2) && (dib_info.bits_per_pixel != 4))
+    ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
+  if ((dib_info.compression == 3) && (dib_info.bits_per_pixel < 16))
+    ThrowReaderException(CorruptImageError,"UnrecognizedBitsPerPixel");
+  switch (dib_info.compression)
+  {
+    case BI_RGB:
+    case BI_RLE8:
+    case BI_RLE4:
+    case BI_BITFIELDS:
+      break;
+    case BI_JPEG:
+      ThrowReaderException(CoderError,"JPEGCompressNotSupported");
+    case BI_PNG:
+      ThrowReaderException(CoderError,"PNGCompressNotSupported");
+    default:
+      ThrowReaderException(CorruptImageError,"UnrecognizedImageCompression");
+  }
+  image->columns=(size_t) MagickAbsoluteValue(dib_info.width);
+  image->rows=(size_t) MagickAbsoluteValue(dib_info.height);
   image->matte=dib_info.bits_per_pixel == 32 ? MagickTrue : MagickFalse;
-  image->columns=(unsigned long) MagickAbsoluteValue(dib_info.width);
-  image->rows=(unsigned long) MagickAbsoluteValue(dib_info.height);
   image->depth=8;
   if ((dib_info.number_colors != 0) || (dib_info.bits_per_pixel < 16))
     {
-- 
2.1.4