Add check preventing div0 issue

There might be a scenario while period is zero or after including
precision would be zero, prevent from division in that case and
return false (to use previously used period).

Bug: 73898703
bug: 74067957
Test: run playback as stability test

Change-Id: I3fad1060b095b7b5ea4c1f9cb3f9d42a4c503560
(cherry picked from commit 27e47ce3c3bbc0b4dc629163de7ebbba7e80b149)
CVE-2018-9354

1 files changed, 5 insertions, 0 deletions

diff --git a/media/libstagefright/VideoFrameScheduler.cpp b/media/libstagefright/VideoFrameScheduler.cpp
index c17faf32d8..b2d12f4da9 100644
--- a/media/libstagefright/VideoFrameScheduler.cpp
+++ b/media/libstagefright/VideoFrameScheduler.cpp
@@ -129,6 +129,11 @@ bool VideoFrameScheduler::PLL::fit(
         numSamplesToUse = mNumSamples;
     }
 
+    if ((period >> kPrecision) == 0 ) {
+        ALOGW("Period is 0, or after including precision is 0 - would cause div0, returning");
+        return false;
+    }
+
     int64_t sumX = 0;
     int64_t sumXX = 0;
     int64_t sumXY = 0;