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| author |   Nathan Lynch <nathanl@linux.ibm.com> | 2019-06-07 00:04:07 -0500 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-06-14 15:36:33 +1000 |
| commit | 0aa82c482ab2ece530a6f44897b63b274bb43c8e (patch) | |
| tree | ab2a3c9ec73a676ff0d3a2bbdbff38bc0727ea68 /arch/powerpc/platforms/pseries/hotplug-memory.c | |
| parent | powerpc/pseries/hvconsole: Fix stack overread via udbg (diff) | |
| download | linux-dev-0aa82c482ab2ece530a6f44897b63b274bb43c8e.tar.xz linux-dev-0aa82c482ab2ece530a6f44897b63b274bb43c8e.zip | |
powerpc/pseries: Fix oops in hotplug memory notifier
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>
Diffstat (limited to 'arch/powerpc/platforms/pseries/hotplug-memory.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/hotplug-memory.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index 47087832f8b2..e6bd172bcf30 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -980,6 +980,9 @@ 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; |