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[Qemu-devel] [PATCH 10/12] qcow2: Fix memory leaks in error cases


From: Kevin Wolf
Subject: [Qemu-devel] [PATCH 10/12] qcow2: Fix memory leaks in error cases
Date: Wed, 8 Jun 2011 15:48:28 +0200

This fixes memory leaks that may be caused by I/O errors during L1 table growth
(can happen during save_vm) and in qemu-img check.

Signed-off-by: Kevin Wolf <address@hidden>
---
 block/qcow2-cluster.c  |    2 +-
 block/qcow2-refcount.c |    9 ++++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 750abe3..c9e7bbd 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -70,7 +70,7 @@ int qcow2_grow_l1_table(BlockDriverState *bs, int min_size, 
bool exact_size)
 
     ret = qcow2_cache_flush(bs, s->refcount_block_cache);
     if (ret < 0) {
-        return ret;
+        goto fail;
     }
 
     BLKDBG_EVENT(bs->file, BLKDBG_L1_GROW_WRITE_TABLE);
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index d62dc1c..ac95b88 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1086,7 +1086,7 @@ int qcow2_check_refcounts(BlockDriverState *bs, 
BdrvCheckResult *res)
     ret = check_refcounts_l1(bs, res, refcount_table, nb_clusters,
                        s->l1_table_offset, s->l1_size, 1);
     if (ret < 0) {
-        return ret;
+        goto fail;
     }
 
     /* snapshots */
@@ -1095,7 +1095,7 @@ int qcow2_check_refcounts(BlockDriverState *bs, 
BdrvCheckResult *res)
         ret = check_refcounts_l1(bs, res, refcount_table, nb_clusters,
             sn->l1_table_offset, sn->l1_size, 0);
         if (ret < 0) {
-            return ret;
+            goto fail;
         }
     }
     inc_refcounts(bs, res, refcount_table, nb_clusters,
@@ -1159,8 +1159,11 @@ int qcow2_check_refcounts(BlockDriverState *bs, 
BdrvCheckResult *res)
         }
     }
 
+    ret = 0;
+
+fail:
     qemu_free(refcount_table);
 
-    return 0;
+    return ret;
 }
 
-- 
1.7.5.2




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