Re: [PATCH v3] Btrfs-progs: add missing path alloc return value check

[Miao Xie <miaox@cn.fujitsu.com>]

On 	mon, 29 Jul 2013 23:37:19 +0100, Filipe David Borba Manana wrote:
> Also remove unused path in extent-tree.c:finish_current_insert().
> 
> Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
> ---
> 
> V2: added 1 more path alloc check and removed unnecessary path
>     allocation in extent-tree.c:finish_current_insert().
> V3: added missing path alloc checks to dir-item.c, file-item.c
>     and btrfs-corrupt-block.c too.

fixup_extent_refs() in cmds-check.c and btrfs_add_root_ref() in root-tree.c also
miss the path allocation check.

Thanks
Miao

> 
>  btrfs-corrupt-block.c |    2 ++
>  dir-item.c            |    2 ++
>  extent-tree.c         |    8 ++++----
>  file-item.c           |    2 ++
>  4 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/btrfs-corrupt-block.c b/btrfs-corrupt-block.c
> index 8176fad..22facd4 100644
> --- a/btrfs-corrupt-block.c
> +++ b/btrfs-corrupt-block.c
> @@ -159,6 +159,8 @@ static int corrupt_extent(struct btrfs_trans_handle *trans,
>  	int should_del = rand() % 3;
>  
>  	path = btrfs_alloc_path();
> +	if (!path)
> +		return -ENOMEM;
>  
>  	key.objectid = bytenr;
>  	key.type = (u8)-1;
> diff --git a/dir-item.c b/dir-item.c
> index f00485a..0ab3c5e 100644
> --- a/dir-item.c
> +++ b/dir-item.c
> @@ -123,6 +123,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
>  	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
>  	key.offset = btrfs_name_hash(name, name_len);
>  	path = btrfs_alloc_path();
> +	if (!path)
> +		return -ENOMEM;
>  	data_size = sizeof(*dir_item) + name_len;
>  	dir_item = insert_with_overflow(trans, root, path, &key, data_size,
>  					name, name_len);
> diff --git a/extent-tree.c b/extent-tree.c
> index f597e16..e4adaa3 100644
> --- a/extent-tree.c
> +++ b/extent-tree.c
> @@ -1487,6 +1487,8 @@ int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
>  	}
>  
>  	path = btrfs_alloc_path();
> +	if (!path)
> +		return -ENOMEM;
>  	path->reada = 1;
>  
>  	key.objectid = bytenr;
> @@ -1577,6 +1579,8 @@ int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
>  				  BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
>  
>  	path = btrfs_alloc_path();
> +	if (!path)
> +		return -ENOMEM;
>  	path->reada = 1;
>  
>  	key.objectid = bytenr;
> @@ -2078,7 +2082,6 @@ static int finish_current_insert(struct btrfs_trans_handle *trans,
>  	u64 end;
>  	u64 priv;
>  	struct btrfs_fs_info *info = extent_root->fs_info;
> -	struct btrfs_path *path;
>  	struct pending_extent_op *extent_op;
>  	struct btrfs_key key;
>  	int ret;
> @@ -2086,8 +2089,6 @@ static int finish_current_insert(struct btrfs_trans_handle *trans,
>  		btrfs_fs_incompat(extent_root->fs_info,
>  				  BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
>  
> -	path = btrfs_alloc_path();
> -
>  	while(1) {
>  		ret = find_first_extent_bit(&info->extent_ins, 0, &start,
>  					    &end, EXTENT_LOCKED);
> @@ -2121,7 +2122,6 @@ static int finish_current_insert(struct btrfs_trans_handle *trans,
>  				  GFP_NOFS);
>  		kfree(extent_op);
>  	}
> -	btrfs_free_path(path);
>  	return 0;
>  }
>  
> diff --git a/file-item.c b/file-item.c
> index 9c787f0..82bf99e 100644
> --- a/file-item.c
> +++ b/file-item.c
> @@ -417,6 +417,8 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans,
>  	root = root->fs_info->csum_root;
>  
>  	path = btrfs_alloc_path();
> +	if (!path)
> +		return -ENOMEM;
>  
>  	while (1) {
>  		key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
>