[Qemu-devel] [PATCH 7/8] Don't abort on out of memory when creating page cache

[Juan Quintela <quintela@redhat.com>]

From: Orit Wasserman <owasserm@redhat.com>

Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 arch_init.c  | 18 ++++++++++++++++--
 page_cache.c | 18 ++++++++++++++----
 2 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/arch_init.c b/arch_init.c
index 5eff80b..1fa5f1f 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -664,8 +664,22 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
             DPRINTF("Error creating cache\n");
             return -1;
         }
-        XBZRLE.encoded_buf = g_malloc0(TARGET_PAGE_SIZE);
-        XBZRLE.current_buf = g_malloc(TARGET_PAGE_SIZE);
+
+        /* We prefer not to abort if there is no memory */
+        XBZRLE.encoded_buf = g_try_malloc0(TARGET_PAGE_SIZE);
+        if (!XBZRLE.encoded_buf) {
+            DPRINTF("Error allocating encoded_buf\n");
+            return -1;
+        }
+
+        XBZRLE.current_buf = g_try_malloc(TARGET_PAGE_SIZE);
+        if (!XBZRLE.current_buf) {
+            DPRINTF("Error allocating current_buf\n");
+            g_free(XBZRLE.encoded_buf);
+            XBZRLE.encoded_buf = NULL;
+            return -1;
+        }
+
         acct_clear();
     }

diff --git a/page_cache.c b/page_cache.c
index a05db64..62a53f8 100644
--- a/page_cache.c
+++ b/page_cache.c
@@ -60,8 +60,12 @@ PageCache *cache_init(int64_t num_pages, unsigned int page_size)
         return NULL;
     }

-    cache = g_malloc(sizeof(*cache));
-
+    /* We prefer not to abort if there is no memory */
+    cache = g_try_malloc(sizeof(*cache));
+    if (!cache) {
+        DPRINTF("Failed to allocate cache\n");
+        return NULL;
+    }
     /* round down to the nearest power of 2 */
     if (!is_power_of_2(num_pages)) {
         num_pages = pow2floor(num_pages);
@@ -74,8 +78,14 @@ PageCache *cache_init(int64_t num_pages, unsigned int page_size)

     DPRINTF("Setting cache buckets to %" PRId64 "\n", cache->max_num_items);

-    cache->page_cache = g_malloc((cache->max_num_items) *
-                                 sizeof(*cache->page_cache));
+    /* We prefer not to abort if there is no memory */
+    cache->page_cache = g_try_malloc((cache->max_num_items) *
+                                     sizeof(*cache->page_cache));
+    if (!cache->page_cache) {
+        DPRINTF("Failed to allocate cache->page_cache\n");
+        g_free(cache);
+        return NULL;
+    }

     for (i = 0; i < cache->max_num_items; i++) {
         cache->page_cache[i].it_data = NULL;
-- 
1.8.5.3