Re: [PATCH] kernfs: fix possibility of NULL pointer dereference.

[Greg Kroah-Hartman]

On Mon, Apr 27, 2020 at 09:48:36AM -0700, youngjun wrote:
> When dentry is negative, "kernfs_dentry_node" returns NULL.
> In this case, "kernfs_root" dereferences NULL pointer.
> 
> Signed-off-by: youngjun <her0gyugyu@xxxxxxxxx>
> ---
>  fs/kernfs/dir.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)

And how can this be triggered on a kernfs filesystem?

thanks,

greg k-h