Re: [f2fs-dev] [PATCH] f2fs: avoid to use a NULL point in destroy_segment_manager

[Gu Zheng <guz.fnst@cn.fujitsu.com>]

On 11/06/2013 09:12 AM, Chao Yu wrote:

> A NULL point should avoid to be used in destroy_segment_manager after allocating memory fail for f2fs_sm_info.

Though without this patch it still can work well, because if it failed
to allocate f2fs_sm_info, the sit_info, free_info... all were NULL, and
the destory path(e.g. destroy_dirty_segmap) can deal with them well.
IMO, this patch is still a good catch. 

Regards,
Gu

> 
> Signed-off-by: Chao Yu <chao2.yu@samsung.com>
> ---
>  fs/f2fs/segment.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 3d4d5fc..ff363e6
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -1744,6 +1744,8 @@ static void destroy_sit_info(struct f2fs_sb_info *sbi)
>  void destroy_segment_manager(struct f2fs_sb_info *sbi)
>  {
>  	struct f2fs_sm_info *sm_info = SM_I(sbi);
> +	if (!sm_info)
> +		return;
>  	destroy_dirty_segmap(sbi);
>  	destroy_curseg(sbi);
>  	destroy_free_segmap(sbi);