[BUG]memblock: fix overflow of array index

[Peter Teoh <htmldeveloper@gmail.com>]

Fixing the mismatch in signed and unsigned type assignment, which
potentially can lead to integer overflow bug.

Thanks.

Reviewed-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Peter Teoh <htmldeveloper@gmail.com>

diff --git a/mm/memblock.c b/mm/memblock.c
index a44eab3..2c621c5 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -553,8 +553,8 @@ void __init_memblock __next_free_mem_range(u64
*idx, int nid,
 {
      struct memblock_type *mem = &memblock.memory;
      struct memblock_type *rsv = &memblock.reserved;
-       int mi = *idx & 0xffffffff;
-       int ri = *idx >> 32;
+       unsigned int mi = *idx & 0xffffffff;
+       unsigned int ri = *idx >> 32;

      for ( ; mi < mem->cnt; mi++) {
              struct memblock_region *m = &mem->regions[mi];



--
Regards,
Peter Teoh

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