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|
Correctly handle crypt() NULL returns when built against glibc 2.17+
Author: mancha
=======
--- gdm-2.20.11/daemon/verify-crypt.c.orig 2013-06-23
+++ gdm-2.20.11/daemon/verify-crypt.c 2013-06-23
@@ -104,7 +104,7 @@ gdm_verify_user (GdmDisplay *d,
const char *username,
gboolean allow_retry)
{
- gchar *login, *passwd, *ppasswd;
+ gchar *login, *passwd, *ppasswd, *cpasswd;
struct passwd *pwent;
#if defined (HAVE_PASSWDEXPIRED) && defined (HAVE_CHPASS) \
|| defined (HAVE_LOGINRESTRICTIONS)
@@ -190,8 +190,10 @@ gdm_verify_user (GdmDisplay *d,
}
/* Check whether password is valid */
- if (ppasswd == NULL || (ppasswd[0] != '\0' &&
- strcmp (crypt (passwd, ppasswd), ppasswd) != 0)) {
+ cpasswd = ppasswd ? crypt (passwd, ppasswd) : NULL;
+ if (ppasswd == NULL || cpasswd == NULL ||
+ (ppasswd[0] != '\0' &&
+ strcmp (cpasswd, ppasswd) != 0)) {
gdm_sleep_no_signal (gdm_daemon_config_get_value_int (GDM_KEY_RETRY_DELAY));
gdm_debug ("Couldn't authenticate user");
@@ -200,6 +202,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (login);
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
return NULL;
}
@@ -217,6 +220,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (login);
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
return NULL;
}
@@ -233,6 +237,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (login);
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
if (message != NULL)
free (message);
return NULL;
@@ -259,6 +264,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (login);
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
return NULL;
}
@@ -266,6 +272,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
if ( ! gdm_slave_check_user_wants_to_log_in (login)) {
g_free (login);
--- gdm-2.20.11/daemon/verify-shadow.c.orig 2013-06-23
+++ gdm-2.20.11/daemon/verify-shadow.c 2013-06-23
@@ -105,7 +105,7 @@ gdm_verify_user (GdmDisplay *d,
const char *username,
gboolean allow_retry)
{
- gchar *login, *passwd, *ppasswd;
+ gchar *login, *passwd, *ppasswd, *cpasswd;
struct passwd *pwent;
struct spwd *sp;
#if defined (HAVE_PASSWDEXPIRED) && defined (HAVE_CHPASS) \
@@ -211,8 +211,10 @@ gdm_verify_user (GdmDisplay *d,
}
/* Check whether password is valid */
- if (ppasswd == NULL || (ppasswd[0] != '\0' &&
- strcmp (crypt (passwd, ppasswd), ppasswd) != 0)) {
+ cpasswd = ppasswd ? crypt (passwd, ppasswd) : NULL;
+ if (ppasswd == NULL || cpasswd == NULL ||
+ (ppasswd[0] != '\0' &&
+ strcmp (cpasswd, ppasswd) != 0)) {
gdm_sleep_no_signal (gdm_daemon_config_get_value_int (GDM_KEY_RETRY_DELAY));
gdm_debug ("Couldn't authenticate user");
@@ -221,6 +223,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (login);
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
return NULL;
}
@@ -238,6 +241,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (login);
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
return NULL;
}
@@ -254,6 +258,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (login);
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
if (message != NULL)
free (message);
return NULL;
@@ -280,6 +285,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (login);
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
return NULL;
}
@@ -287,6 +293,7 @@ gdm_verify_user (GdmDisplay *d,
g_free (passwd);
g_free (ppasswd);
+ g_free (cpasswd);
if ( ! gdm_slave_check_user_wants_to_log_in (login)) {
g_free (login);
|
