mm, compaction: fully assume capture is not NULL in compact_zone_order()
authorVlastimil Babka <vbabka@suse.cz>
Thu, 2 Apr 2020 04:10:35 +0000 (21:10 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 2 Apr 2020 16:35:31 +0000 (09:35 -0700)
commit6467552ca64c4ddd2b83ed73192107d7145f533b
tree6a82012f652237d6b3c35fef2b75a3f5f9283211
parent1da2f328fa643bd72197dfed0c655148af31e4eb
mm, compaction: fully assume capture is not NULL in compact_zone_order()

Dan reports:

The patch 5e1f0f098b46: "mm, compaction: capture a page under direct
compaction" from Mar 5, 2019, leads to the following Smatch complaint:

    mm/compaction.c:2321 compact_zone_order()
     error: we previously assumed 'capture' could be null (see line 2313)

mm/compaction.c
  2288  static enum compact_result compact_zone_order(struct zone *zone, int order,
  2289                  gfp_t gfp_mask, enum compact_priority prio,
  2290                  unsigned int alloc_flags, int classzone_idx,
  2291                  struct page **capture)
                                      ^^^^^^^

  2313 if (capture)
                    ^^^^^^^
Check for NULL

  2314 current->capture_control = &capc;
  2315
  2316 ret = compact_zone(&cc, &capc);
  2317
  2318 VM_BUG_ON(!list_empty(&cc.freepages));
  2319 VM_BUG_ON(!list_empty(&cc.migratepages));
  2320
  2321 *capture = capc.page;
                ^^^^^^^^
Unchecked dereference.

  2322 current->capture_control = NULL;
  2323

In practice this is not an issue, as the only caller path passes non-NULL
capture:

__alloc_pages_direct_compact()
  struct page *page = NULL;
  try_to_compact_pages(capture = &page);
    compact_zone_order(capture = capture);

So let's remove the unnecessary check, which should also make Smatch happy.

Fixes: 5e1f0f098b46 ("mm, compaction: capture a page under direct compaction")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Link: http://lkml.kernel.org/r/18b0df3c-0589-d96c-23fa-040798fee187@suse.cz
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/compaction.c