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[Qemu-devel] Re: [PATCH 05/18] vl.c: add deleted flag for deleting the h


From: Yoshiaki Tamura
Subject: [Qemu-devel] Re: [PATCH 05/18] vl.c: add deleted flag for deleting the handler.
Date: Thu, 24 Feb 2011 11:47:54 +0900
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; ja; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7

Juan Quintela wrote:
Yoshiaki Tamura<address@hidden>  wrote:
Make deleting handlers robust against deletion of any elements in a
handler by using a deleted flag like in file descriptors.

Signed-off-by: Yoshiaki Tamura<address@hidden>
---
  vl.c |   13 +++++++++----
  1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/vl.c b/vl.c
index b436952..4e263c3 100644
--- a/vl.c
+++ b/vl.c
@@ -1158,6 +1158,7 @@ static void nographic_update(void *opaque)
  struct vm_change_state_entry {
      VMChangeStateHandler *cb;
      void *opaque;
+    int deleted;
      QLIST_ENTRY (vm_change_state_entry) entries;
  };

@@ -1178,8 +1179,7 @@ VMChangeStateEntry 
*qemu_add_vm_change_state_handler(VMChangeStateHandler *cb,

  void qemu_del_vm_change_state_handler(VMChangeStateEntry *e)
  {
-    QLIST_REMOVE (e, entries);
-    qemu_free (e);
+    e->deleted = 1;
  }

  void vm_state_notify(int running, int reason)
@@ -1188,8 +1188,13 @@ void vm_state_notify(int running, int reason)

      trace_vm_state_notify(running, reason);

-    for (e = vm_change_state_head.lh_first; e; e = e->entries.le_next) {
-        e->cb(e->opaque, running, reason);

this needs to become:

+    QLIST_FOREACH(e,&vm_change_state_head, entries) {
+        if (e->deleted) {
+            QLIST_REMOVE(e, entries);
+            qemu_free(e);
+        } else {
+            e->cb(e->opaque, running, reason);
+        }

    VMChangeState_entry *next;

    QLIST_FOREACH_SAFE(e,&vm_change_state_head, entries, next) {
       .....

   Otherwise you are accessing "e" after qemu_free and being put out of
   the list.

You're right.  Thanks.

Yoshi


Later, Juan.





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