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From b75b57e4a5b75f03c5d302ced1287f47de6c9ccc Mon Sep 17 00:00:00 2001
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From: Orit Wasserman <owasserm@redhat.com>
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Date: Tue, 11 Feb 2014 15:32:37 +0100
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Subject: [PATCH 16/28] Don't abort on memory allocation error
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RH-Author: Orit Wasserman <owasserm@redhat.com>
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Message-id: <1392132757-18587-4-git-send-email-owasserm@redhat.com>
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Patchwork-id: 57211
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O-Subject: [RHEL7 qemu-kvm PATCH 3/3] Don't abort on memory allocation error
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Bugzilla: 1047448
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RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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It is better to fail migration in case of failure to
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allocate new cache item
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Signed-off-by: Orit Wasserman <owasserm@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit 89db9987c07977bdb78d5d4b41d65e7acb9a5a2c)
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---
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 arch_init.c                    |  4 +++-
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 include/migration/page_cache.h |  4 +++-
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 page_cache.c                   | 16 +++++++++++-----
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 3 files changed, 17 insertions(+), 7 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 arch_init.c                    |    4 +++-
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 include/migration/page_cache.h |    4 +++-
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 page_cache.c                   |   16 +++++++++++-----
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 3 files changed, 17 insertions(+), 7 deletions(-)
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diff --git a/arch_init.c b/arch_init.c
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index fc0f569..0aacdac 100644
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--- a/arch_init.c
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+++ b/arch_init.c
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@@ -286,7 +286,9 @@ static int save_xbzrle_page(QEMUFile *f, uint8_t *current_data,
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     if (!cache_is_cached(XBZRLE.cache, current_addr)) {
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         if (!last_stage) {
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-            cache_insert(XBZRLE.cache, current_addr, current_data);
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+            if (cache_insert(XBZRLE.cache, current_addr, current_data) == -1) {
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+                return -1;
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+            }
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         }
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         acct_info.xbzrle_cache_miss++;
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         return -1;
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diff --git a/include/migration/page_cache.h b/include/migration/page_cache.h
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index 87894fe..d156f0d 100644
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--- a/include/migration/page_cache.h
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+++ b/include/migration/page_cache.h
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@@ -60,11 +60,13 @@ uint8_t *get_cached_data(const PageCache *cache, uint64_t addr);
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  * cache_insert: insert the page into the cache. the page cache
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  * will dup the data on insert. the previous value will be overwritten
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  *
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+ * Returns -1 on error
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+ *
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  * @cache pointer to the PageCache struct
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  * @addr: page address
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  * @pdata: pointer to the page
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  */
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-void cache_insert(PageCache *cache, uint64_t addr, uint8_t *pdata);
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+int cache_insert(PageCache *cache, uint64_t addr, uint8_t *pdata);
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 /**
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  * cache_resize: resize the page cache. In case of size reduction the extra
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diff --git a/page_cache.c b/page_cache.c
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index 2920123..250772d 100644
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--- a/page_cache.c
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+++ b/page_cache.c
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@@ -151,7 +151,7 @@ uint8_t *get_cached_data(const PageCache *cache, uint64_t addr)
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     return cache_get_by_addr(cache, addr)->it_data;
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 }
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-void cache_insert(PageCache *cache, uint64_t addr, uint8_t *pdata)
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+int cache_insert(PageCache *cache, uint64_t addr, uint8_t *pdata)
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 {
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     CacheItem *it = NULL;
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@@ -162,16 +162,22 @@ void cache_insert(PageCache *cache, uint64_t addr, uint8_t *pdata)
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     /* actual update of entry */
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     it = cache_get_by_addr(cache, addr);
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-    /* free old cached data if any */
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-    g_free(it->it_data);
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-
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+    /* allocate page */
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     if (!it->it_data) {
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+        it->it_data = g_try_malloc(cache->page_size);
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+        if (!it->it_data) {
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+            DPRINTF("Error allocating page\n");
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+            return -1;
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+        }
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         cache->num_items++;
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     }
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-    it->it_data = g_memdup(pdata, cache->page_size);
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+    memcpy(it->it_data, pdata, cache->page_size);
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+
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     it->it_age = ++cache->max_item_age;
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     it->it_addr = addr;
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+
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+    return 0;
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 }
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 int64_t cache_resize(PageCache *cache, int64_t new_num_pages)
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-- 
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1.7.1
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