From: Alastair D'Silva <alast...@d-silva.org>
It is possible for firmware to allocate memory ranges outside
the range of physical memory that we support (MAX_PHYSMEM_BITS).
This patch adds a bounds check to ensure that any hotplugged
memory is addressable.
Signed-off-by: Alastair D'Silva <alast...@d-silva.org>
---
arch/powerpc/mm/mem.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 9191a66b3bc5..de18fb73de30 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -111,6 +111,9 @@ int __ref arch_add_memory(int nid, u64 start, u64 size,
unsigned long nr_pages = size >> PAGE_SHIFT;
int rc;
+ if ((start + size - 1) >> MAX_PHYSMEM_BITS)
+ return -EINVAL;
+
resize_hpt_for_hotplug(memblock_phys_mem_size());
start = (unsigned long)__va(start);
--
2.21.0
