From 8ca330bd709bf7c000dfda5b1edbc0cbeabb8b55 Mon Sep 17 00:00:00 2001
From: Jouni Malinen <jouni@codeaurora.org>
Date: Fri, 5 Feb 2021 00:28:17 +0200
Subject: Flush pending control interface message for an interface to be
removed
wpa_supplicant_ctrl_iface_deinit() was executed only if the
per-interface control interface initialization had been completed. This
is not the case if driver initialization fails and that could result in
leaving behind references to the freed wpa_s instance in a corner case
where control interface messages ended up getting queued.
Fix this by calling wpa_supplicant_ctrl_iface_deinit() in all cases to
cancel the potential eloop timeout for wpas_ctrl_msg_queue_timeout with
the reference to the wpa_s pointer. In addition, flush any pending
message from the global queue for this interface since such a message
cannot be of use after this and there is no need to leave them in the
queue until the global control interface gets deinitialized.
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
---
wpa_supplicant/ctrl_iface.h | 10 +++++---
wpa_supplicant/ctrl_iface_named_pipe.c | 5 +++-
wpa_supplicant/ctrl_iface_udp.c | 6 ++++-
wpa_supplicant/ctrl_iface_unix.c | 43 +++++++++++++++++++++++++++++++++-
wpa_supplicant/eapol_test.c | 6 ++---
wpa_supplicant/preauth_test.c | 6 ++---
wpa_supplicant/wpa_supplicant.c | 10 ++++----
7 files changed, 66 insertions(+), 20 deletions(-)
diff --git a/wpa_supplicant/ctrl_iface.h b/wpa_supplicant/ctrl_iface.h
index 510668d..dfbd25a 100644
--- a/wpa_supplicant/ctrl_iface.h
+++ b/wpa_supplicant/ctrl_iface.h
@@ -70,14 +70,17 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s);
/**
* wpa_supplicant_ctrl_iface_deinit - Deinitialize control interface
+ * @wpa_s: Pointer to wpa_supplicant data
* @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
*
* Deinitialize the control interface that was initialized with
- * wpa_supplicant_ctrl_iface_init().
+ * wpa_supplicant_ctrl_iface_init() and any data related to the wpa_s instance.
+ * @priv may be %NULL if the control interface has not yet been initialized.
*
* Required to be implemented in each control interface backend.
*/
-void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv);
+void wpa_supplicant_ctrl_iface_deinit(struct wpa_supplicant *wpa_s,
+ struct ctrl_iface_priv *priv);
/**
* wpa_supplicant_ctrl_iface_wait - Wait for ctrl_iface monitor
@@ -128,7 +131,8 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
}
static inline void
-wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
+wpa_supplicant_ctrl_iface_deinit(struct wpa_supplicant *wpa_s,
+ struct ctrl_iface_priv *priv)
{
}
diff --git a/wpa_supplicant/ctrl_iface_named_pipe.c b/wpa_supplicant/ctrl_iface_named_pipe.c
index 79ff787..bddc041 100644
--- a/wpa_supplicant/ctrl_iface_named_pipe.c
+++ b/wpa_supplicant/ctrl_iface_named_pipe.c
@@ -462,8 +462,11 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
}
-void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
+void wpa_supplicant_ctrl_iface_deinit(struct wpa_supplicant *wpa_s,
+ struct ctrl_iface_priv *priv)
{
+ if (!priv)
+ return;
while (priv->ctrl_dst)
ctrl_close_pipe(priv->ctrl_dst);
if (priv->sec_attr_set)
diff --git a/wpa_supplicant/ctrl_iface_udp.c b/wpa_supplicant/ctrl_iface_udp.c
index 1512080..1cbf7fa 100644
--- a/wpa_supplicant/ctrl_iface_udp.c
+++ b/wpa_supplicant/ctrl_iface_udp.c
@@ -490,8 +490,12 @@ fail:
}
-void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
+void wpa_supplicant_ctrl_iface_deinit(struct wpa_supplicant *wpa_s,
+ struct ctrl_iface_priv *priv)
{
+ if (!priv)
+ return;
+
if (priv->sock > -1) {
eloop_unregister_read_sock(priv->sock);
if (priv->ctrl_dst) {
diff --git a/wpa_supplicant/ctrl_iface_unix.c b/wpa_supplicant/ctrl_iface_unix.c
index 953fd2c..639573d 100644
--- a/wpa_supplicant/ctrl_iface_unix.c
+++ b/wpa_supplicant/ctrl_iface_unix.c
@@ -800,12 +800,52 @@ static int wpas_ctrl_iface_reinit(struct wpa_supplicant *wpa_s,
}
-void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
+static void
+wpas_global_ctrl_iface_flush_queued_msg(struct wpa_global *global,
+ struct wpa_supplicant *wpa_s)
+{
+ struct ctrl_iface_global_priv *gpriv;
+ struct ctrl_iface_msg *msg, *prev_msg;
+ unsigned int count = 0;
+
+ if (!global || !global->ctrl_iface)
+ return;
+
+ gpriv = global->ctrl_iface;
+ dl_list_for_each_safe(msg, prev_msg, &gpriv->msg_queue,
+ struct ctrl_iface_msg, list) {
+ if (msg->wpa_s == wpa_s) {
+ count++;
+ dl_list_del(&msg->list);
+ os_free(msg);
+ }
+ }
+
+ if (count) {
+ wpa_printf(MSG_DEBUG,
+ "CTRL: Dropped %u pending message(s) for interface that is being removed",
+ count);
+ }
+}
+
+
+void wpa_supplicant_ctrl_iface_deinit(struct wpa_supplicant *wpa_s,
+ struct ctrl_iface_priv *priv)
{
struct wpa_ctrl_dst *dst, *prev;
struct ctrl_iface_msg *msg, *prev_msg;
struct ctrl_iface_global_priv *gpriv;
+ if (!priv) {
+ /* Control interface has not yet been initialized, so there is
+ * nothing to deinitialize here. However, there might be a
+ * pending message for this interface, so get rid of any such
+ * entry before completing interface removal. */
+ wpas_global_ctrl_iface_flush_queued_msg(wpa_s->global, wpa_s);
+ eloop_cancel_timeout(wpas_ctrl_msg_queue_timeout, wpa_s, NULL);
+ return;
+ }
+
if (priv->sock > -1) {
char *fname;
char *buf, *dir = NULL;
@@ -877,6 +917,7 @@ free_dst:
}
}
}
+ wpas_global_ctrl_iface_flush_queued_msg(wpa_s->global, wpa_s);
eloop_cancel_timeout(wpas_ctrl_msg_queue_timeout, priv->wpa_s, NULL);
os_free(priv);
}
diff --git a/wpa_supplicant/eapol_test.c b/wpa_supplicant/eapol_test.c
index d137ad6..e256ac5 100644
--- a/wpa_supplicant/eapol_test.c
+++ b/wpa_supplicant/eapol_test.c
@@ -674,10 +674,8 @@ static void test_eapol_clean(struct eapol_test_data *e,
os_free(e->radius_conf);
e->radius_conf = NULL;
scard_deinit(wpa_s->scard);
- if (wpa_s->ctrl_iface) {
- wpa_supplicant_ctrl_iface_deinit(wpa_s->ctrl_iface);
- wpa_s->ctrl_iface = NULL;
- }
+ wpa_supplicant_ctrl_iface_deinit(wpa_s, wpa_s->ctrl_iface);
+ wpa_s->ctrl_iface = NULL;
ext_password_deinit(wpa_s->ext_pw);
wpa_s->ext_pw = NULL;
diff --git a/wpa_supplicant/preauth_test.c b/wpa_supplicant/preauth_test.c
index de49948..97c16fb 100644
--- a/wpa_supplicant/preauth_test.c
+++ b/wpa_supplicant/preauth_test.c
@@ -193,10 +193,8 @@ static void test_eapol_clean(struct wpa_supplicant *wpa_s)
pmksa_candidate_free(wpa_s->wpa);
wpa_sm_deinit(wpa_s->wpa);
scard_deinit(wpa_s->scard);
- if (wpa_s->ctrl_iface) {
- wpa_supplicant_ctrl_iface_deinit(wpa_s->ctrl_iface);
- wpa_s->ctrl_iface = NULL;
- }
+ wpa_supplicant_ctrl_iface_deinit(wpa_s, wpa_s->ctrl_iface);
+ wpa_s->ctrl_iface = NULL;
wpa_config_free(wpa_s->conf);
}
diff --git a/wpa_supplicant/wpa_supplicant.c b/wpa_supplicant/wpa_supplicant.c
index 90e8a46..835b335 100644
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -1158,8 +1158,8 @@ int wpa_supplicant_reload_configuration(struct wpa_supplicant *wpa_s)
os_strcmp(conf->ctrl_interface,
wpa_s->conf->ctrl_interface) != 0);
- if (reconf_ctrl && wpa_s->ctrl_iface) {
- wpa_supplicant_ctrl_iface_deinit(wpa_s->ctrl_iface);
+ if (reconf_ctrl) {
+ wpa_supplicant_ctrl_iface_deinit(wpa_s, wpa_s->ctrl_iface);
wpa_s->ctrl_iface = NULL;
}
@@ -6748,10 +6748,8 @@ static void wpa_supplicant_deinit_iface(struct wpa_supplicant *wpa_s,
if (terminate)
wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_TERMINATING);
- if (wpa_s->ctrl_iface) {
- wpa_supplicant_ctrl_iface_deinit(wpa_s->ctrl_iface);
- wpa_s->ctrl_iface = NULL;
- }
+ wpa_supplicant_ctrl_iface_deinit(wpa_s, wpa_s->ctrl_iface);
+ wpa_s->ctrl_iface = NULL;
#ifdef CONFIG_MESH
if (wpa_s->ifmsh) {
--
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