NULL pointer issue in dm-mpath.c

NULL pointer issue in dm-mpath.c

[Alan D. Brunelle]

While looking at this file, I noticed:

         if (!pgpath->pg->ps.type) {
                 DMWARN("Reinstate path not supported by path selector %s",
                        pgpath->pg->ps.type->name);
                 r = -EINVAL;
                 goto out;
         }

The DMWARN will end up following a NULL pointer (as pgpath->pg->ps.type 
is NULL). I have no idea how to fix this, nor if its really possible to 
hit this error case, nonetheless I thought I'd point this out. (As maybe 
someone out there would know how to correctly patch this.)

Regards,
Alan D. Brunelle
HP Open Source & Linux Organization / Scalability & Performance Group