On Sun, Mar 15, 2015 at 01:39:21AM +0100, Alexander Holler wrote:
> Am 13.03.2015 um 17:42 schrieb Al Viro:
> > Assorted fixes around AIO on gadgetfs: leaks, use-after-free,
> > troubles caused by ->f_op flipping. Please, pull from
> > git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git gadget
> >
> > Shortlog:
> > Al Viro (8):
> > new helper: dup_iter()
> > move iov_iter.c from mm/ to lib/
> > gadget/function/f_fs.c: close leaks
> > gadget/function/f_fs.c: use put iov_iter into io_data
> > gadget/function/f_fs.c: switch to ->{read,write}_iter()
>
> > gadgetfs: use-after-free in ->aio_read()
>
> If that patch ends up in the stable kernels (as it is marked as such),
> it needs a
> value = -ENOMEM
> before that added "goto fail;", otherwise the return value is unitialized.
Umm... If I'm not misparsing what you said, you are talking about the
one that gets removed by
- if (iv) {
- priv->iv = kmemdup(iv, nr_segs * sizeof(struct iovec),
- GFP_KERNEL);
- if (!priv->iv) {
- kfree(priv);
- goto fail;
- }
- }
in "gadget: switch ep_io_operations to ->read_iter/->write_iter" very
shortly afterwards, and _that_ is a prereq for ->f_op flipping fixes,
which is also clear -stable fodder. But yes, it's a bisect hazard and
a cherry-pick one as well. Nice catch...
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