fsnotify: don't put user context if it was never assigned

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.

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();

Signed-off-by: Sasha Levin <[email protected]>
Cc: John McCutchan <[email protected]>
Cc: Robert Love <[email protected]>
Cc: Eric Paris <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions