Michael Ellerman <m...@ellerman.id.au> writes: > Nathan Lynch <nath...@linux.ibm.com> writes: > >> 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 <nath...@linux.ibm.com> > > 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.