Commit db36a461 authored by Gavin Shan's avatar Gavin Shan Committed by Linus Torvalds

mm/sparse: more checks on mem_section number

__section_nr() was implemented to retrieve the corresponding memory
section number according to its descriptor.  It's possible that the
specified memory section descriptor doesn't exist in the global array.  So
add more checking on that and report an error for a wrong case.
Signed-off-by: default avatarGavin Shan <shangw@linux.vnet.ibm.com>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5b760e64
......@@ -130,6 +130,8 @@ int __section_nr(struct mem_section* ms)
break;
}
VM_BUG_ON(root_nr == NR_SECTION_ROOTS);
return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
}
......
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