Btrfs: open_ctree: Fix possible memory leak

After reading one of chunk or tree root tree's root node from disk, if the
root node does not have EXTENT_BUFFER_UPTODATE flag set, we fail to release
the memory used by the root node. Fix this.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index aa59871885da..807f6854acaa 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2842,6 +2842,8 @@ int open_ctree(struct super_block *sb,
             !extent_buffer_uptodate(chunk_root->node)) {
                 printk(KERN_ERR "BTRFS: failed to read chunk root on %s\n",
                        sb->s_id);
+                if (!IS_ERR(chunk_root->node))
+                        free_extent_buffer(chunk_root->node);
                 chunk_root->node = NULL;
                 goto fail_tree_roots;
         }
@@ -2880,6 +2882,8 @@ retry_root_backup:
             !extent_buffer_uptodate(tree_root->node)) {
                 printk(KERN_WARNING "BTRFS: failed to read tree root on %s\n",
                        sb->s_id);
+                if (!IS_ERR(tree_root->node))
+                        free_extent_buffer(tree_root->node);
                 tree_root->node = NULL;
                 goto recovery_tree_root;
         }