From 32a1c08b60a8ac0e63b54a5793a26b5e32b36618 Mon Sep 17 00:00:00 2001
From: Peter Lieven <pl@dlhnet.de>
Date: Mon, 25 Feb 2013 19:12:03 +0200
Subject: page_cache: fix memory leak

XBZRLE encoded migration introduced a MRU page cache
meachnism. Unfortunately, cached items where never freed in
case of a collision in the page cache on cache_insert().

This lead to out of memory conditions during XBZRLE migration
if the page cache was small and there where a lot of collisions
in the cache.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Orit Wasserman <owasserm@redhat.com>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 page_cache.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'page_cache.c')

diff --git a/page_cache.c b/page_cache.c
index e5717d53c9..809dadc7eb 100644
--- a/page_cache.c
+++ b/page_cache.c
@@ -152,6 +152,9 @@ void cache_insert(PageCache *cache, uint64_t addr, uint8_t *pdata)
     /* actual update of entry */
     it = cache_get_by_addr(cache, addr);
 
+    /* free old cached data if any */
+    g_free(it->it_data);
+
     if (!it->it_data) {
         cache->num_items++;
     }
-- 
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