Re: [PATCH] aio: fix a user triggered use after free (and fix freeze protection of aio writes)
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: 2016-10-29 20:09:27
Also in:
linux-fsdevel, lkml
On Sat, Oct 29, 2016 at 12:17 PM, Al Viro [off-list ref] wrote:
AFAICS, the possibility of dropping the last reference to struct file before ->write_iter() has returned is fundamentally broken. I might be missing something subtle here, but...
Ok, let's add a get_file(); fput(); around that whole iter call sequence.
And that's a separate issue from "we should hold the fs freezer lock
around the whole operation". So I think we need both.
Does that make everybody happy?
Linus