Re: [PATCH] devpts: Fix NULL pointer dereference in dcache_readdir()

[Al Viro]

On Fri, Oct 04, 2019 at 04:05:03PM +0200, Christian Brauner wrote:
> From: Will Deacon <will@xxxxxxxxxx>
> 
> Closing /dev/pts/ptmx removes the corresponding pty under /dev/pts/
> without synchronizing against concurrent path walkers. This can lead to
> 'dcache_readdir()' tripping over a 'struct dentry' with a NULL 'd_inode'
> field:

FWIW, vfs.git#fixes (or #next.dcache) ought to deal with that one.