OSV-2022-1112 Heap-buffer-overflow in wmem_strbuf_append_vprintf

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52797 Crash type: Heap-buffer-overflow READ Crash state: wmemstrbufappendvprintf wmemstrbufappendprintf dissectdibs...