mm: prevent derefencing NULL ptr in pfn_section_valid()

Commit 5ec8e8e ("mm/sparsemem: fix race in accessing
memory_section->usage") changed pfn_section_valid() to add a READ_ONCE()
call around "ms->usage" to fix a race with section_deactivate() where
ms->usage can be cleared.  The READ_ONCE() call, by itself, is not enough
to prevent NULL pointer dereference.  We need to check its value before
dereferencing it.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 5ec8e8e ("mm/sparsemem: fix race in accessing memory_section->usage")
Signed-off-by: Waiman Long <[email protected]>
Cc: Charan Teja Kalla <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Waiman-Long

include/linux/mmzone.h

@@ -1979,8 +1979,9 @@ static inline int subsection_map_index(unsigned long pfn)
 static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn)
 {
 	int idx = subsection_map_index(pfn);
+	struct mem_section_usage *usage = READ_ONCE(ms->usage);
 
-	return test_bit(idx, READ_ONCE(ms->usage)->subsection_map);
+	return usage ? test_bit(idx, usage->subsection_map) : 0;
 }
 #else
 static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn)