btrfs: Fix memory leakage in the tree-log.c

In add_inode_ref() function:

Initializes local pointers.

Reduces the logical condition with the __add_inode_ref() return
value by using only one 'goto out'.

Centralizes the exiting, ensuring the freeing of all used memory.

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Reviewed-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index f2e0531..d12696d 100644 (file)
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1113,11 +1113,11 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
                                  struct extent_buffer *eb, int slot,
                                  struct btrfs_key *key)
 {
-       struct inode *dir;
-       struct inode *inode;
+       struct inode *dir = NULL;
+       struct inode *inode = NULL;
        unsigned long ref_ptr;
        unsigned long ref_end;
-       char *name;
+       char *name = NULL;
        int namelen;
        int ret;
        int search_done = 0;
@@ -1150,13 +1150,15 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
         * care of the rest
         */
        dir = read_one_inode(root, parent_objectid);
-       if (!dir)
-               return -ENOENT;
+       if (!dir) {
+               ret = -ENOENT;
+               goto out;
+       }
 
        inode = read_one_inode(root, inode_objectid);
        if (!inode) {
-               iput(dir);
-               return -EIO;
+               ret = -EIO;
+               goto out;
        }
 
        while (ref_ptr < ref_end) {
@@ -1169,14 +1171,16 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
                         */
                        if (!dir)
                                dir = read_one_inode(root, parent_objectid);
-                       if (!dir)
-                               return -ENOENT;
+                       if (!dir) {
+                               ret = -ENOENT;
+                               goto out;
+                       }
                } else {
                        ret = ref_get_fields(eb, ref_ptr, &namelen, &name,
                                             &ref_index);
                }
                if (ret)
-                       return ret;
+                       goto out;
 
                /* if we already have a perfect match, we're done */
                if (!inode_in_dir(root, path, btrfs_ino(dir), btrfs_ino(inode),
@@ -1196,12 +1200,11 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
                                                      parent_objectid,
                                                      ref_index, name, namelen,
                                                      &search_done);
-                               if (ret == 1) {
-                                       ret = 0;
+                               if (ret) {
+                                       if (ret == 1)
+                                               ret = 0;
                                        goto out;
                                }
-                               if (ret)
-                                       goto out;
                        }
 
                        /* insert our name */
@@ -1215,6 +1218,7 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
 
                ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + namelen;
                kfree(name);
+               name = NULL;
                if (log_ref_ver) {
                        iput(dir);
                        dir = NULL;
@@ -1225,6 +1229,7 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
        ret = overwrite_item(trans, root, path, eb, slot, key);
 out:
        btrfs_release_path(path);
+       kfree(name);
        iput(dir);
        iput(inode);
        return ret;