conf: Remove console stream callback only when freeing console helper

Commit ba226d334acbc49f6751b430e0c4e00f69eef6bf tried to fix crash of
the daemon when a domain with an open console was destroyed. The fix was
wrong as it tried to remove the callback also when the stream was
aborted, where at that point the fd stream driver was already freed and
removed.

This patch clears the callbacks with a helper right before the hash is
freed, so that it doesn't interfere with other codepaths where the
stream object is freed.

diff --git a/src/conf/virconsole.c b/src/conf/virconsole.c
index 912aff6224b744d945ea805c11bc69a80d3d67ad..b3f6eb69c7d2742790b9f23c5574b0df75fdce50 100644 (file)
--- a/src/conf/virconsole.c
+++ b/src/conf/virconsole.c
@@ -219,9 +219,6 @@ static void virConsoleHashEntryFree(void *data,
     const char *pty = name;
     virStreamPtr st = data;
 
-    /* remove callback from stream */
-    virFDStreamSetInternalCloseCb(st, NULL, NULL, NULL);
-
     /* free stream reference */
     virStreamFree(st);
 
@@ -289,6 +286,18 @@ error:
     return NULL;
 }
 
+/**
+ * Helper to clear stream callbacks when freeing the hash
+ */
+static void virConsoleFreeClearCallbacks(void *payload,
+                                         const void *name ATTRIBUTE_UNUSED,
+                                         void *data ATTRIBUTE_UNUSED)
+{
+    virStreamPtr st = payload;
+
+    virFDStreamSetInternalCloseCb(st, NULL, NULL, NULL);
+}
+
 /**
  * Free structures for handling open console streams.
  *
@@ -300,6 +309,7 @@ void virConsoleFree(virConsolesPtr cons)
         return;
 
     virMutexLock(&cons->lock);
+    virHashForEach(cons->hash, virConsoleFreeClearCallbacks, NULL);
     virHashFree(cons->hash);
     virMutexUnlock(&cons->lock);
     virMutexDestroy(&cons->lock);