Results 3 issues of Gr3yD0g

in the function tab-to-csv of tab-to-csv.c, when call write_wchars, the args `end` pass to the write_wchars can be overflow by the operation `i- 1`,the will cause a DoS [poc](https://github.com/D4rkD0g/POCs/tree/master/Bin/Tools-data-tools/tab-to-csv)

Hi, the hnswlib will crashed when init index if the parameter if too big ```python import hnswlib h = hnswlib.Index(space='l2', dim=1) h.init_index(max_elements=1, ef_construction=200, M=2305843009213693951) h.add_items([1], -1) ``` the backtrace ```...

sirius@lambda:~/Desktop/stegdetect-master$ valgrind ./stegdetect -tF ../crashes/id\:000001\,sig\:11\,src\:000000\,op\:flip1\,pos\:297 ==91335== Memcheck, a memory error detector ==91335== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al. ==91335== Using Valgrind-3.11.0 and LibVEX; rerun with...