Re: [PATCH] percpu_ref: don't refer to ref->data if it isn't allocated

[Eric Biggers <ebiggers@xxxxxxxxxx>]

On Fri, Oct 09, 2020 at 12:03:56PM +0800, Ming Lei wrote:
> We can't check ref->data->confirm_switch directly in __percpu_ref_exit(), since
> ref->data may not be allocated in one not-initialized refcount.
> 
> Fixes: 2b0d3d3e4fcf ("percpu_ref: reduce memory footprint of percpu_ref in fast path")
> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>

Please don't forget:

Reported-by: syzbot+fd15ff734dace9e16437@xxxxxxxxxxxxxxxxxxxxxxxxx