OSV-2021-204 Heap-buffer-overflow in WelsDec::NeedErrorCon

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29604 Crash type: Heap-buffer-overflow READ 1 Crash state: WelsDec::NeedErrorCon WelsDec::CheckAndFinishLastPic WelsDecodeBs...

OSV-2020-2065 Use-of-uninitialized-value in WelsDec::NeedErrorCon

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26291 Crash type: Use-of-uninitialized-value Crash state: WelsDec::NeedErrorCon WelsDec::CheckAndFinishLastPic WelsDecodeBs...