lkml.org 
[lkml]   [2019]   [Oct]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] ocfs2:fix potential Null Ptr Dereference
From
Date


On 19/10/10 09:07, Yizhuo wrote:
> Inside function o2hb_region_blocks_store(), to_o2hb_region()
> could return NULL but there's no check before its dereference,
> which is potentially unsafe.

As I described before, this won't happen IMHO.
configfs item is initialized after loading module, so region should
be valid here.


Thanks,
Joseph

>
> Signed-off-by: Yizhuo <yzhai003@ucr.edu>
> ---
> fs/ocfs2/cluster/heartbeat.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
> index a368350d4c27..93f2b540f245 100644
> --- a/fs/ocfs2/cluster/heartbeat.c
> +++ b/fs/ocfs2/cluster/heartbeat.c
> @@ -1628,7 +1628,7 @@ static ssize_t o2hb_region_blocks_store(struct config_item *item,
> unsigned long tmp;
> char *p = (char *)page;
>
> - if (reg->hr_bdev)
> + if (!reg || reg->hr_bdev)
> return -EINVAL;
>
> tmp = simple_strtoul(p, &p, 0);
>

\
 
 \ /
  Last update: 2019-10-10 03:33    [W:0.020 / U:0.640 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site