vnc_refresh: calling vnc_update_client might free vs
Hi all,
this patch fixes another bug in vnc_refresh: calling vnc_update_client
might cause vs to be free()ed, in this case we cannot access vs->next
right after to examine the next item on the list.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/vnc.c b/vnc.c
index cc2a26e..92facde 100644
--- a/vnc.c
+++ b/vnc.c
@@ -2345,7 +2345,7 @@
static void vnc_refresh(void *opaque)
{
VncDisplay *vd = opaque;
- VncState *vs = NULL;
+ VncState *vs = NULL, *vn = NULL;
int has_dirty = 0, rects = 0;
vga_hw_update();
@@ -2354,8 +2354,10 @@
vs = vd->clients;
while (vs != NULL) {
+ vn = vs->next;
rects += vnc_update_client(vs, has_dirty);
- vs = vs->next;
+ /* vs might be free()ed here */
+ vs = vn;
}
/* vd->timer could be NULL now if the last client disconnected,
* in this case don't update the timer */
