Prevent crash for malformed ID3 COMM frame

When trying to retrieve the full text string from a malformed
ID3 COMM frame, there is a risk of getting a negative index
value if the size of the frame is too small.

Adding a size check to avoid negative indexes.

Bug: 31815576
Test: Playback content with malformed ID3 COMM frame
Change-Id: I21253e104cd76a65f5ab5d03f58490e0f4a4cb65
1 file changed