linux-kernel - Re: [Kernel-BR] [PATCH] btrfs: Fix memory leakage in the tree-log.c

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Date:	Wed, 9 Oct 2013 20:22:29 -0300
From:	Felipe Pena <felipensp@...il.com>
To:	kernel-br <kernel-br@...glegroups.com>
Cc:	chris.mason@...ionio.com, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, "Geyslan G. Bem" <geyslan@...il.com>
Subject: Re: [Kernel-BR] [PATCH] btrfs: Fix memory leakage in the tree-log.c

Hi,

On Wed, Oct 9, 2013 at 8:13 PM, Geyslan G. Bem <geyslan@...il.com> wrote:
> In some cases, add_inode_ref() is returning without freeing
> the 'name' pointer.
>
> Added bail out to explicitly call kfree when necessary.
>
> Signed-off-by: Geyslan G. Bem <geyslan@...il.com>
> ---
>  fs/btrfs/tree-log.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
> index 79f057c..37d32c3 100644
> --- a/fs/btrfs/tree-log.c
> +++ b/fs/btrfs/tree-log.c
> @@ -1170,13 +1170,18 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
>                         if (!dir)
>                                 dir = read_one_inode(root, parent_objectid);
>                         if (!dir)
> -                               return -ENOENT;
> +                       {
> +                               ret = -ENOENT;
> +                               goto bail;
> +                       }

No braces required here.


>                 } else {
>                         ret = ref_get_fields(eb, ref_ptr, &namelen, &name,
>                                              &ref_index);
>                 }
>                 if (ret)
> -                       return ret;
> +               {
> +                       goto bail;
> +               }
>

Ditto.

>                 /* if we already have a perfect match, we're done */
>                 if (!inode_in_dir(root, path, btrfs_ino(dir), btrfs_ino(inode),
> @@ -1214,7 +1219,6 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
>                 }
>
>                 ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + namelen;
> -               kfree(name);
>                 if (log_ref_ver) {
>                         iput(dir);
>                         dir = NULL;
> @@ -1227,6 +1231,9 @@ out:
>         btrfs_release_path(path);
>         iput(dir);
>         iput(inode);
> +bail:
> +       if (name)
> +               kfree(name);
>         return ret;
>  }
>
> --
> 1.8.4
>
> --
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-- 
Regards,
Felipe Pena
--
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