libxls/fuzz_xls: Heap-buffer-overflow in xls_isCellTooSmall

Project: https://github.com/libxls/libxls.git Detailed report: https://oss-fuzz.com/testcase?key=5085850579238912 Project: libxls Fuzzer: afllibxlsfuzzxls Fuzz target binary: fuzzxls Job Type: aflasanlibxls Platform Id: linux Crash Type: Heap-buffer-overflow READ 1 Crash Address: 0x603000002008...