Re: [PATCH] powerpc/pseries: fix oops in hotplug memory notifier

Michael Ellerman [off-list ref] writes:

Nathan Lynch [off-list ref] writes:

quoted

During post-migration device tree updates, we can oops in
pseries_update_drconf_memory if the source device tree has an
ibm,dynamic-memory-v2 property and the destination has a
ibm,dynamic_memory (v1) property. The notifier processes an "update"
for the ibm,dynamic-memory property but it's really an add in this
scenario. So make sure the old property object is there before
dereferencing it.

Signed-off-by: Nathan Lynch <redacted>

Can you pinpoint a commit that introduced the bug? Should we backport
this to stable?

Perhaps?
  Fixes: 2b31e3aec1db ("powerpc/drmem: Add support for ibm, dynamic-memory-v2 property")

I guess I had considered it a latent bug, but you're right - we wouldn't
hit it until the v2 support was added. So that commit is correct. Let me
know if I should resend.