Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler. Number of rules (primarily dangerous function names) in C/C++ ruleset: 223 Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/color.c Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/color.h Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/oily_png_ext.c Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/oily_png_ext.h Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/operations.c Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/operations.h Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/png_decoding.c Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/png_decoding.h Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/png_encoding.c Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/png_encoding.h Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/resampling.c Examining data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/resampling.h FINAL RESULTS: data/ruby-oily-png-1.2.1~dfsg/ext/oily_png/png_decoding.c:336:5: [2] (buffer) memcpy: Does not check for buffer overflows when copying to destination (CWE-120). Make sure destination can always hold the source data. memcpy(bytes, RSTRING_PTR(stream) + FIX2LONG(start_pos), pass_size); ANALYSIS SUMMARY: Hits = 1 Lines analyzed = 1403 in approximately 0.06 seconds (24295 lines/second) Physical Source Lines of Code (SLOC) = 975 Hits@level = [0] 0 [1] 0 [2] 1 [3] 0 [4] 0 [5] 0 Hits@level+ = [0+] 1 [1+] 1 [2+] 1 [3+] 0 [4+] 0 [5+] 0 Hits/KSLOC@level+ = [0+] 1.02564 [1+] 1.02564 [2+] 1.02564 [3+] 0 [4+] 0 [5+] 0 Dot directories skipped = 1 (--followdotdir overrides) Minimum risk level = 1 Not every hit is necessarily a security vulnerability. There may be other security vulnerabilities; review your code! See 'Secure Programming HOWTO' (https://dwheeler.com/secure-programs) for more information.