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Release calc 2.12.7.2

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Fixed a segfault when getpwuid() returned NULL during initialization.
Thanks goes to baratharon GitHub user for reporting this issue.
This commit is contained in:
Landon Curt Noll
2018-11-28 12:27:04 -08:00
parent 37ad43c7fd
commit c5e416c41f
6 changed files with 38 additions and 24 deletions
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33
lib_calc.c
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@@ -1,7 +1,7 @@
/*
* lib_calc - calc link library initialization and shutdown routines
*
* Copyright (C) 1999-2007 Landon Curt Noll
* Copyright (C) 1999-2007,2018 Landon Curt Noll
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
@@ -504,22 +504,35 @@ initenv(void)
home = (c ? strdup(c) : NULL);
#if defined(_WIN32)
if (home == NULL || home[0] == '\0') {
/* free home if it was previously allocated, but empty */
if (home != NULL) {
free(home);
}
/* just assume . is home if all else fails */
home = ".";
home = strdup(".");
}
#else /* Windoz free systems */
if (home == NULL || home[0] == '\0') {
size_t pw_dir_len;
ent = (struct passwd *)getpwuid(geteuid());
if (ent == NULL) {
/* just assume . is home if all else fails */
home = ".";
/* free home if it was previously allocated, but empty */
if (home != NULL) {
free(home);
}
/* try using the home directory of current effective UID from password file */
ent = (struct passwd *)getpwuid(geteuid());
if (ent == NULL || ent->pw_dir == NULL || ent->pw_dir[0] == '\0') {
/* just assume . is home if all else fails */
home = strdup(".");
} else {
/* use home directory of current effective UID from password file */
home = strdup(ent->pw_dir);
}
pw_dir_len = strlen(ent->pw_dir);
home = (char *)malloc(pw_dir_len+1);
strncpy(home, ent->pw_dir, pw_dir_len+1);
}
#endif /* Windoz free systems */
/* paranoia */
if (home == NULL) {
math_error("Unable to allocate string for $HOME");
/*NOTREACHED*/
}
/* determine the $PAGER value */
c = (no_env ? NULL : getenv(PAGER));