On 09/11/2014 04:43 PM, Andrew Morton wrote:
> On Tue, 29 Jul 2014 09:25:14 -0400 Sasha Levin <sasha.le...@oracle.com> wrote:
>
>> > On some failure paths we may attempt to free user context even
>> > if it wasn't assigned yet. This will cause a NULL ptr deref
>> > and a kernel BUG.
> Are you able to identify "some failure paths"? I spent some time
> grepping, but it's a pain.
>
> Please try to include such info in changelogs because reviewers (ie,
> me) might want to review those callers to decide whether the bug lies
> elsewhere.
>
Sorry about that.
The path I was looking at is in inotify_new_group():
oevent = kmalloc(sizeof(struct inotify_event_info), GFP_KERNEL);
if (unlikely(!oevent)) {
fsnotify_destroy_group(group);
return ERR_PTR(-ENOMEM);
}
fsnotify_destroy_group() would get called here, but group->inotify_data.user
is only getting assigned later:
group->inotify_data.user = get_current_user();
Thanks,
Sasha
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