[Ocfs2-devel] [PATCH] ocfs2: fix NULL pointer dereference in function ocfs2_abort_trigger()

[Joseph Qi]

On 2015/5/22 11:10, Xue jiufei wrote:
> Function ocfs2_abort_trigger() use bh->b_assoc_map to get sb.
> But there's no function to set bh->b_assoc_map in ocfs2, it
> will trigger NULL pointer dereference while calling this
> function. We can get sb from bh->b_bdev->bd_super instead of
> b_assoc_map.
> 
> Signed-off-by: joyce.xue <xuejiufei at huawei.com>
> ---
>  fs/ocfs2/journal.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
> index ff53192..11cb383 100644
> --- a/fs/ocfs2/journal.c
> +++ b/fs/ocfs2/journal.c
> @@ -573,7 +573,7 @@ static void ocfs2_abort_trigger(struct jbd2_buffer_trigger_type *triggers,
>  
>  	/* We aren't guaranteed to have the superblock here - but if we
>  	 * don't, it'll just crash. */
Should we delete this comments correspondingly?

> -	ocfs2_error(bh->b_assoc_map->host->i_sb,
> +	ocfs2_error(bh->b_bdev->bd_super,
>  		    "JBD2 has aborted our journal, ocfs2 cannot continue\n");
>  }
>  
>