OSV-2020-2063 Heap-buffer-overflow in WelsDec::WelsDecodeMbCavlcBSlice

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26296 Crash type: Heap-buffer-overflow WRITE 16 Crash state: WelsDec::WelsDecodeMbCavlcBSlice WelsDec::WelsDecodeSlice WelsDec::DecodeCurrentAccessUnit...

OSV-2020-2062 Heap-buffer-overflow in WelsDec::WelsDecodeMbCabacISliceBaseMode0

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26303 Crash type: Heap-buffer-overflow WRITE 4 Crash state: WelsDec::WelsDecodeMbCabacISliceBaseMode0 WelsDec::WelsDecodeMbCabacISlice WelsDec::WelsDecodeSlice...