monitor/att: Fix crash when accessing packet_conn

This fixes the following crash:

:monitor/att.c:2697:11: runtime error: member access within null
pointer of type 'struct att_conn_data'

diff --git a/monitor/att.c b/monitor/att.c
index 68ad790..db68187 100644 (file)
--- a/monitor/att.c
+++ b/monitor/att.c
@@ -2575,7 +2575,12 @@ static void att_conn_data_free(void *data)
 
 static struct att_conn_data *att_get_conn_data(struct packet_conn_data *conn)
 {
-       struct att_conn_data *data = conn->data;
+       struct att_conn_data *data;
+
+       if (!conn)
+               return NULL;
+
+       data = conn->data;
 
        if (data)
                return data;
@@ -2609,6 +2614,8 @@ static void att_read_type_req(const struct l2cap_frame *frame)
 
        conn = packet_get_conn_data(frame->handle);
        data = att_get_conn_data(conn);
+       if (!data)
+               return;
 
        if (!data->reads)
                data->reads = queue_new();