Fail gracefully for KTX files with width or height of zero.

third_party/ktx/ktx.cpp

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "ktx.h"
 #include "SkBitmap.h"
@@ skipping 238 matching lines @@
 
         // We don't support texture arrays
         if (fHeader.fNumberOfArrayElements > 1) {
             return false;
         }
 
         // We don't support cube maps
         if (fHeader.fNumberOfFaces > 1) {
             return false;
         }
+
+        // We don't support width and/or height <= 0
+        if (fHeader.fPixelWidth <= 0 || fHeader.fPixelHeight <= 0) {
+            return false;
+        }
     }
 
     // Make sure that we have enough bytes left for the key/value
     // data according to what was said in the header.
     if (bytesLeft < fHeader.fBytesOfKeyValueData) {
         return false;
     }
 
     // Next read the key value pairs
     size_t keyValueBytesRead = 0;
@@ skipping 276 matching lines @@
         for (int i = 0; i < height; ++i) {
             if (!stream->write(rowPtr, bpp*width)) {
                 return false;
             }
             rowPtr += bitmap.rowBytes();
         }
     }
     
     return true;
 }