make pw_encrypt() return malloc'ed string.

   text    data     bss     dec     hex filename
 759802     604    6684  767090   bb472 busybox_old
 759804     604    6676  767084   bb46c busybox_unstripped

3 files changed, 15 insertions, 7 deletions

diff --git a/loginutils/chpasswd.c b/loginutils/chpasswd.c
index 230ab0f..7308596 100644
--- a/loginutils/chpasswd.c
+++ b/loginutils/chpasswd.c
@@ -65,6 +65,7 @@ int chpasswd_main(int argc ATTRIBUTE_UNUSED, char **argv)
 			bb_info_msg("Password for '%s' changed", name);
 		logmode = LOGMODE_STDIO;
 		free(name);
+		free(pass);
 	}
 
 	return 0;
diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index fad226c..0a31137 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -16,22 +16,24 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
 	char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
 	char *orig = (char*)"";
 	char *newp = NULL;
-	char *cipher = NULL;
 	char *cp = NULL;
 	char *ret = NULL; /* failure so far */
 
 	if (myuid && pw->pw_passwd[0]) {
+		char *encrypted;
+
 		orig = bb_askpass(0, "Old password:"); /* returns ptr to static */
 		if (!orig)
 			goto err_ret;
-		cipher = pw_encrypt(orig, pw->pw_passwd, 1); /* returns ptr to static */
-		if (strcmp(cipher, pw->pw_passwd) != 0) {
+		encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
+		if (strcmp(encrypted, pw->pw_passwd) != 0) {
 			syslog(LOG_WARNING, "incorrect password for '%s'",
 				pw->pw_name);
 			bb_do_delay(FAIL_DELAY);
 			puts("Incorrect password");
 			goto err_ret;
 		}
+		if (ENABLE_FEATURE_CLEAN_UP) free(encrypted);
 	}
 	orig = xstrdup(orig); /* or else bb_askpass() will destroy it */
 	newp = bb_askpass(0, "New password:"); /* returns ptr to static */
@@ -55,8 +57,8 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
 		strcpy(salt, "$1$");
 		crypt_make_salt(salt + 3, 4, 0);
 	}
-	/* pw_encrypt returns ptr to static */
-	ret = xstrdup(pw_encrypt(newp, salt, 1));
+	/* pw_encrypt returns malloced str */
+	ret = pw_encrypt(newp, salt, 1);
 	/* whee, success! */
 
  err_ret:
@@ -64,7 +66,6 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
 	if (ENABLE_FEATURE_CLEAN_UP) free(orig);
 	nuke_str(newp);
 	if (ENABLE_FEATURE_CLEAN_UP) free(newp);
-	nuke_str(cipher);
 	nuke_str(cp);
 	return ret;
 }
diff --git a/loginutils/sulogin.c b/loginutils/sulogin.c
index f52ce8a..38812a6 100644
--- a/loginutils/sulogin.c
+++ b/loginutils/sulogin.c
@@ -72,6 +72,9 @@ int sulogin_main(int argc ATTRIBUTE_UNUSED, char **argv)
 #endif
 
 	while (1) {
+		char *encrypted;
+		int r;
+
 		/* cp points to a static buffer that is zeroed every time */
 		cp = bb_askpass(timeout,
 				"Give root password for system maintenance\n"
@@ -81,7 +84,10 @@ int sulogin_main(int argc ATTRIBUTE_UNUSED, char **argv)
 			bb_info_msg("Normal startup");
 			return 0;
 		}
-		if (strcmp(pw_encrypt(cp, pwd->pw_passwd, 1), pwd->pw_passwd) == 0) {
+		encrypted = pw_encrypt(cp, pwd->pw_passwd, 1);
+		r = strcmp(encrypted, pwd->pw_passwd);
+		free(encrypted);
+		if (r == 0) {
 			break;
 		}
 		bb_do_delay(FAIL_DELAY);