Re: [PATCH] ext4: fix bh leak on error paths in ext4_rename() and ext4_cross_rename()

Jan Kara
2015-03-04T15:03:46Z

On Tue 03-03-15 14:17:19, Konstantin Khlebnikov wrote:
> Release references to buffer-heads if ext4_journal_start() fails.
Looks good. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

Honza

>
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
> Fixes: 5b61de757535 ("ext4: start handle at least possible moment when renaming files")
> ---
> fs/ext4/namei.c | 21 +++++++++++++++------
> 1 file changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 28fe71a2904c..8110dd20ad3f 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -3264,12 +3264,18 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
> EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
> if (!(flags & RENAME_WHITEOUT)) {
> handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
> - if (IS_ERR(handle))
> - return PTR_ERR(handle);
> + if (IS_ERR(handle)) {
> + retval = PTR_ERR(handle);
> + handle = NULL;
> + goto end_rename;
> + }
> } else {
> whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
> - if (IS_ERR(whiteout))
> - return PTR_ERR(whiteout);
> + if (IS_ERR(whiteout)) {
> + retval = PTR_ERR(whiteout);
> + whiteout = NULL;
> + goto end_rename;
> + }
> }
>
> if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
> @@ -3433,8 +3439,11 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
> handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
> (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
> 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
> - if (IS_ERR(handle))
> - return PTR_ERR(handle);
> + if (IS_ERR(handle)) {
> + retval = PTR_ERR(handle);
> + handle = NULL;
> + goto end_rename;
> + }
>
> if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
> ext4_handle_sync(handle);
>
> --
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--
Jan Kara <jack@suse.cz>
SUSE Labs, CR