Fix crash when mkvparser returns a NULL BlockEntry.

BUG=https://bugs.chromium.org/p/webm/issues/detail?id=1090

Change-Id: I64b7b19581f15d53048e3026c3f8946e344fbe26

diff --git a/webmdec.cc b/webmdec.cc
index f541cfecc1692ebb6894d3ffa5efc42970249c2a..c4539a0b947a99ab350eb1974fdc79c574a947a2 100644 (file)
--- a/webmdec.cc
+++ b/webmdec.cc
@@ -164,7 +164,7 @@ int webm_read_frame(struct WebmInputContext *webm_ctx,
       }
       get_new_block = true;
     }
-    if (status) {
+    if (status || block_entry == NULL) {
       return -1;
     }
     if (get_new_block) {