Fix DETACH command debug prints to avoid use of freed memory

In case a control interface socket is detached because of sendmsg()
failing for the socket, function call to detach the socket uses a
pointer to the socket information in the structure to be freed. Reorder
code to print socket info before freeing the data to avoid use of freed
memory in case debug prints are enabled.

Signed-hostap: Jouni Malinen <j@w1.fi>

diff --git a/wpa_supplicant/ctrl_iface_udp.c b/wpa_supplicant/ctrl_iface_udp.c
index f3b660d..0f53d56 100644 (file)
--- a/wpa_supplicant/ctrl_iface_udp.c
+++ b/wpa_supplicant/ctrl_iface_udp.c
@@ -80,14 +80,14 @@ static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
        while (dst) {
                if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
                    from->sin_port == dst->addr.sin_port) {
+                       wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached "
+                                  "%s:%d", inet_ntoa(from->sin_addr),
+                                  ntohs(from->sin_port));
                        if (prev == NULL)
                                priv->ctrl_dst = dst->next;
                        else
                                prev->next = dst->next;
                        os_free(dst);
-                       wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached "
-                                  "%s:%d", inet_ntoa(from->sin_addr),
-                                  ntohs(from->sin_port));
                        return 0;
                }
                prev = dst;

diff --git a/wpa_supplicant/ctrl_iface_unix.c b/wpa_supplicant/ctrl_iface_unix.c
index cd26eab..879ab7b 100644 (file)
--- a/wpa_supplicant/ctrl_iface_unix.c
+++ b/wpa_supplicant/ctrl_iface_unix.c
@@ -94,12 +94,12 @@ static int wpa_supplicant_ctrl_iface_detach(struct dl_list *ctrl_dst,
                    os_memcmp(from->sun_path, dst->addr.sun_path,
                              fromlen - offsetof(struct sockaddr_un, sun_path))
                    == 0) {
-                       dl_list_del(&dst->list);
-                       os_free(dst);
                        wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
                                    (u8 *) from->sun_path,
                                    fromlen -
                                    offsetof(struct sockaddr_un, sun_path));
+                       dl_list_del(&dst->list);
+                       os_free(dst);
                        return 0;
                }
        }