SUNRPC: NULL utsname dereference on NFS umount during namespace cleanup

Fix an Oopsable condition when nsm_mon_unmon is called as part of the
namespace cleanup, which now apparently happens after the utsname
has been freed.

Link: http://lkml.kernel.org/r/[email protected]
Reported-by: Bruno PrĂ©mont <[email protected]>
Cc: [email protected] # 3.18
Signed-off-by: Trond Myklebust <[email protected]>
4 files changed