https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78433
--- Comment #8 from Dominik Vogt <vogt at linux dot vnet.ibm.com> --- This code from maybe_script_execute() writes past the allocated array bounds: /* Construct an argument list for the shell. */ char *new_argv[argc + 1]; ^^^^^^^^ new_argv[0] = (char *) _PATH_BSHELL; new_argv[1] = (char *) file; if (argc > 1) memcpy (new_argv + 2, argv + 1, argc * sizeof(char *)); ^^^^^ ^^^^^^ else new_argv[2] = NULL; ^^^ Before the patch, Gcc often allocated several bytes more than necessary so that many off-by-one bugs went unnoticed.