http://git.qemu.org/?p=qemu.git;a=patch;h=8409dc884a201bf74b30a9d232b6bbdd00cb7e2b
this patch is from qemu-git.


From 8409dc884a201bf74b30a9d232b6bbdd00cb7e2b Mon Sep 17 00:00:00 2001
From: Li Qiang <liqiang6-s@360.cn>
Date: Wed, 4 Jan 2017 00:43:16 -0800
Subject: [PATCH] serial: fix memory leak in serial exit

The serial_exit_core function doesn't free some resources.
This can lead memory leak when hotplug and unplug. This
patch avoid this.

Signed-off-by: Li Qiang <liqiang6-s@360.cn>
Message-Id: <586cb5ab.f31d9d0a.38ac3.acf2@mx.google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/char/serial.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/hw/char/serial.c b/hw/char/serial.c
index ffbacd8227..67b18eda12 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -906,6 +906,16 @@ void serial_realize_core(SerialState *s, Error **errp)
 void serial_exit_core(SerialState *s)
 {
     qemu_chr_fe_deinit(&s->chr);
+
+    timer_del(s->modem_status_poll);
+    timer_free(s->modem_status_poll);
+
+    timer_del(s->fifo_timeout_timer);
+    timer_free(s->fifo_timeout_timer);
+
+    fifo8_destroy(&s->recv_fifo);
+    fifo8_destroy(&s->xmit_fifo);
+
     qemu_unregister_reset(serial_reset, s);
 }
 
-- 
2.11.0

