[linux-pam] pam_unix: Check for NULL return from Goodcrypt_md5().

[Tomáš Mráz]

commit aff9b0f2b67eac784c99536fede9423da66f194a
Author: Tomas Mraz <tmraz(a)fedoraproject.org&gt;
Date:   Thu Jun 19 13:51:20 2014 +0200

    pam_unix: Check for NULL return from Goodcrypt_md5().
    
    modules/pam_unix/pam_unix_passwd.c (check_old_password): Check for
    NULL return from Goodcrypt_md5().

 modules/pam_unix/pam_unix_passwd.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modules/pam_unix/pam_unix_passwd.c b/modules/pam_unix/pam_unix_passwd.c
index 606071e..2d330e5 100644
--- a/modules/pam_unix/pam_unix_passwd.c
+++ b/modules/pam_unix/pam_unix_passwd.c
@@ -301,7 +301,7 @@ static int check_old_password(const char *forwho, const char
*newpass)
 			s_pas = strtok_r(NULL, ":,", &sptr);
 			while (s_pas != NULL) {
 				char *md5pass = Goodcrypt_md5(newpass, s_pas);
-				if (!strcmp(md5pass, s_pas)) {
+				if (md5pass == NULL || !strcmp(md5pass, s_pas)) {
 					_pam_delete(md5pass);
 					retval = PAM_AUTHTOK_ERR;
 					break;