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useradd: fix segfault trying to overwrite const data with mkstemp

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Also fix memory leaks in error paths.
This commit is contained in:
Tomas Mraz 2018-10-12 10:14:02 +02:00
parent fb97da1ce1
commit 10e388efc2
1 changed files with 37 additions and 21 deletions
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52
src/useradd.c
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@ -343,7 +343,7 @@ static void fail_exit (int code)
static void get_defaults (void)
{
FILE *fp;
char* default_file = USER_DEFAULTS_FILE;
char *default_file = USER_DEFAULTS_FILE;
char buf[1024];
char *cp;
@ -353,6 +353,8 @@ static void get_defaults (void)
len = strlen(prefix) + strlen(USER_DEFAULTS_FILE) + 2;
default_file = malloc(len);
if (default_file == NULL)
return;
wlen = snprintf(default_file, len, "%s/%s", prefix, USER_DEFAULTS_FILE);
assert (wlen == (int) len -1);
}
@ -363,7 +365,7 @@ static void get_defaults (void)
fp = fopen (default_file, "r");
if (NULL == fp) {
return;
goto getdef_err;
}
/*
@ -474,7 +476,7 @@ static void get_defaults (void)
}
}
(void) fclose (fp);
getdef_err:
if(prefix[0]) {
free(default_file);
}
@ -509,8 +511,8 @@ static int set_defaults (void)
FILE *ifp;
FILE *ofp;
char buf[1024];
char* new_file = NEW_USER_FILE;
char* default_file = USER_DEFAULTS_FILE;
char *new_file = NULL;
char *default_file = USER_DEFAULTS_FILE;
char *cp;
int ofd;
int wlen;
@ -521,17 +523,30 @@ static int set_defaults (void)
bool out_shell = false;
bool out_skel = false;
bool out_create_mail_spool = false;
if(prefix[0]) {
size_t len;
int ret = -1;
len = strlen(prefix) + strlen(NEW_USER_FILE) + 2;
new_file = malloc(len);
wlen = snprintf(new_file, len, "%s/%s", prefix, NEW_USER_FILE);
assert (wlen == (int) len -1);
if (new_file == NULL) {
fprintf (stderr,
_("%s: cannot create new defaults file: %s\n"),
Prog, strerror(errno));
return -1;
}
wlen = snprintf(new_file, len, "%s%s%s", prefix, prefix[0]?"/":"", NEW_USER_FILE);
assert (wlen <= (int) len -1);
if(prefix[0]) {
len = strlen(prefix) + strlen(USER_DEFAULTS_FILE) + 2;
default_file = malloc(len);
if (default_file == NULL) {
fprintf (stderr,
_("%s: cannot create new defaults file: %s\n"),
Prog, strerror(errno));
goto setdef_err;
}
wlen = snprintf(default_file, len, "%s/%s", prefix, USER_DEFAULTS_FILE);
assert (wlen == (int) len -1);
}
@ -544,7 +559,7 @@ static int set_defaults (void)
fprintf (stderr,
_("%s: cannot create new defaults file\n"),
Prog);
return -1;
goto setdef_err;
}
ofp = fdopen (ofd, "w");
@ -552,7 +567,7 @@ static int set_defaults (void)
fprintf (stderr,
_("%s: cannot open new defaults file\n"),
Prog);
return -1;
goto setdef_err;
}
/*
@ -579,7 +594,7 @@ static int set_defaults (void)
_("%s: line too long in %s: %s..."),
Prog, default_file, buf);
(void) fclose (ifp);
return -1;
goto setdef_err;
}
}
@ -643,7 +658,7 @@ static int set_defaults (void)
|| (fsync (fileno (ofp)) != 0)
|| (fclose (ofp) != 0)) {
unlink (new_file);
return -1;
goto setdef_err;
}
/*
@ -658,7 +673,7 @@ static int set_defaults (void)
_("%s: Cannot create backup file (%s): %s\n"),
Prog, buf, strerror (err));
unlink (new_file);
return -1;
goto setdef_err;
}
/*
@ -669,7 +684,7 @@ static int set_defaults (void)
fprintf (stderr,
_("%s: rename: %s: %s\n"),
Prog, new_file, strerror (err));
return -1;
goto setdef_err;
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USYS_CONFIG, Prog,
@ -683,13 +698,14 @@ static int set_defaults (void)
(unsigned int) def_group, def_home, def_shell,
def_inactive, def_expire, def_template,
def_create_mail_spool));
if(prefix[0]) {
ret = 0;
setdef_err:
free(new_file);
if(prefix[0]) {
free(default_file);
}
return 0;
return ret;
}
/*