iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/pseries: Fix oops in hotplug memory notifier

Browse Source 
commit 0aa82c482ab2ece530a6f44897b63b274bb43c8e upstream.

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.

Fixes: 2b31e3aec1db ("powerpc/drmem: Add support for ibm, dynamic-memory-v2 property")
Cc: stable@vger.kernel.org # v4.16+
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nathan Lynch 2019-06-07 00:04:07 -05:00 committed by Greg Kroah-Hartman
parent e725502b85
commit 01982f7bcc
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/platforms/pseries/hotplug-memory.c
View File

@ -1012,6 +1012,9 @@ static int pseries_update_drconf_memory(struct of_reconfig_data *pr)
if (!memblock_size)
return -EINVAL;
if (!pr->old_prop)
return 0;
p = (__be32 *) pr->old_prop->value;
if (!p)
return -EINVAL;