diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index fe4527d..03d2a29 100644
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -1893,7 +1893,7 @@
                 size = 0;
             }
 
-            if (SIZE_MAX - chunk_size <= size) {
+            if ((chunk_size > SIZE_MAX) || (SIZE_MAX - chunk_size <= size)) {
                 return ERROR_MALFORMED;
             }