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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: Gavin Shan <shangw@linux.vnet.ibm.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -130,6 +130,8 @@ int __section_nr(struct mem_section* ms)
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break;
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}
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VM_BUG_ON(root_nr == NR_SECTION_ROOTS);
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return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
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}
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