kernel: CVE-2018-16871 nfs: NULL pointer dereference due to an anomalized NFS message sequence

[Wade Mealing <wmealing () redhat com>]

A flaw was found in NFS in the Linux Kernel. An attacker who is able
to mount an exported NFS file system  is able to trigger a null
pointer dereference by an invalid NFS sequence.

This can panic the machine with a null pointer dereference and
therefore deny to the NFS server. Any outstanding disk writes to the
NFS server will be lost.

Upstream fix:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=01310bb7c9c98752cc763b36532fab028e0f8f81

Red Hat bugzilla:

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16871

Thanks,

Wade Mealing