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mm/sparse.c: check the return value of sparse_index_alloc()
Since sparse_index_alloc() can return NULL on memory allocation failure, we must deal with the failure condition when calling it. Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com> Cc: Christoph Lameter <clameter@sgi.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -83,6 +83,8 @@ static int __meminit sparse_index_init(unsigned long section_nr, int nid)
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return -EEXIST;
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section = sparse_index_alloc(nid);
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if (!section)
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return -ENOMEM;
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/*
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* This lock keeps two different sections from
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* reallocating for the same index
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