Checking structure sizes before reading them from memory to avoid overflowing the buffer's stream.

src/core/SkBuffer.cpp

Index: src/core/SkBuffer.cpp
diff --git a/src/core/SkBuffer.cpp b/src/core/SkBuffer.cpp
index 915264d957f057840da9d831a05aa242e50132cc..32a8011ac787a34f26ab1f57869aba1b7b5e180e 100644
--- a/src/core/SkBuffer.cpp
+++ b/src/core/SkBuffer.cpp
@@ -34,6 +34,13 @@ size_t SkRBuffer::skipToAlign4()
     return n;
 }
 
+void SkRBufferWithSizeCheck::read(void* buffer, size_t size) {
+    fError = fError || (fPos + size > fStop);
+    if (!fError && (size > 0)) {
+        readNoSizeCheck(buffer, size);
+    }
+}
+
 void* SkWBuffer::skip(size_t size)
 {
     void* result = fPos;