Fix div zero error in corrupted media file

Some corrupted media file has timescale value as zero and shouldn't be used.

Change-Id: I8f6a347f8651cdc7e8c370ab1881e1a5fcb30839
Signed-off-by: Dan Liang <dan.liang@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index 8bf7f63..3dd8b11 100644
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -1172,6 +1172,11 @@ status_t MPEG4Extractor::parseChunk(off64_t *offset, int depth) {
                 return ERROR_IO;
             }
 
+            if (!timescale) {
+                ALOGE("timescale should not be ZERO.");
+                return ERROR_MALFORMED;
+            }
+
             mLastTrack->timescale = ntohl(timescale);
 
             // 14496-12 says all ones means indeterminate, but some files seem to use
@@ -2636,6 +2641,11 @@ status_t MPEG4Extractor::verifyTrack(Track *track) {
         return ERROR_MALFORMED;
     }
 
+    if (track->timescale == 0) {
+        ALOGE("timescale invalid.");
+        return ERROR_MALFORMED;
+    }
+
     return OK;
 }