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 <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/sparse.c b/mm/sparse.c
index e06f514fe04faa748c5e50e3f4cb25789d977238..d245e59048a8ac115faf5fcacbccf505e5a5a347 100644 (file)
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -83,6 +83,8 @@ static int __meminit sparse_index_init(unsigned long section_nr, int nid)
                return -EEXIST;
 
        section = sparse_index_alloc(nid);
+       if (!section)
+               return -ENOMEM;
        /*
         * This lock keeps two different sections from
         * reallocating for the same index