[glib-networking/mcatanzaro/#20: 3/6] Hold op_mutex during base_check

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 6ca388a217268623a15627436b55933911638a4b
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Jan 26 14:28:58 2020 -0600

    Hold op_mutex during base_check
    
    I'm not comfortable with accessing priv members without the mutex.

 tls/base/gtlsconnection-base.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/tls/base/gtlsconnection-base.c b/tls/base/gtlsconnection-base.c
index b35cee4..b0df15e 100644
--- a/tls/base/gtlsconnection-base.c
+++ b/tls/base/gtlsconnection-base.c
@@ -896,10 +896,15 @@ g_tls_connection_base_check (GTlsConnectionBase  *tls,
                              GIOCondition         condition)
 {
   GTlsConnectionBasePrivate *priv = g_tls_connection_base_get_instance_private (tls);
+  gboolean ret = FALSE;
+
+  g_mutex_lock (&priv->op_mutex);
 
-  /* Racy, but worst case is that we just get WOULD_BLOCK back */
   if (priv->need_finish_handshake)
-    return TRUE;
+    {
+      ret = TRUE;
+      goto out;
+    }
 
   /* If op or close is in progress, then tls_istream and tls_ostream are
    * blocked, regardless of the base stream status. Note this also
@@ -907,10 +912,14 @@ g_tls_connection_base_check (GTlsConnectionBase  *tls,
    */
   if (((condition & G_IO_IN) && (priv->reading || priv->read_closing)) ||
       ((condition & G_IO_OUT) && (priv->writing || priv->write_closing)))
-    return FALSE;
+    goto out;
 
   /* Defer to the base stream or GDatagramBased. */
-  return g_tls_connection_base_base_check (tls, condition);
+  ret = g_tls_connection_base_base_check (tls, condition);
+
+out:
+  g_mutex_unlock (&priv->op_mutex);
+  return ret;
 }
 
 typedef struct {