OSV-2020-2081 UNKNOWN READ in presym_sym2name

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26400 Crash type: UNKNOWN READ Crash state: presymsym2name sym2namelen mrbsymnamelen...

shopify-scripts: SIGSEGV in str_buf_cat

PoC ------------------- Attached as teststrbufcat.rb Debug - mirb ------------------- Program received signal SIGSEGV, Segmentation fault. memcpysse2unaligned at ../sysdeps/x8664/multiarch/memcpy-sse2-unaligned.S:36 36 ../sysdeps/x8664/multiarch/memcpy-sse2-unaligned.S: No such file or directory...