Re: [PATCH] vfs: Fix possible NULL pointer dereference ininode_permission()

[Paul E. McKenney]

On Fri, Jan 10, 2014 at 06:41:03AM +0800, Linus Torvalds wrote:
> I think the sane short term fix is to make the kfree() of the i_security
> member be a rcu free, and not clear the member.

Interesting use case.  ;-)

							Thanx, Paul

> Not pretty, but should did this case..
> 
>      Linus
> 
> On Jan 10, 2014 6:31 AM, "Al Viro" <viro@xxxxxxxxxxxxxxxxxx> wrote:
> >
> > iput() definitely can sleep (that's when actual truncation and inode
> > freeing is done for opened-and-unlinked files - on the final iput() after
> > close()), but that' irrelevant here - fsnotify_delete_inode() grabs
> > a bunch of mutexes, which makes calling it from rcu callback no-go.

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