mainline inclusion
from mainline-5.13
commit b3b64ebd
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I3ZVL2
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3b64ebd38225d8032b5db42938d969b602040c2

-------------------------------------------------

Dan Carpenter reported the following

  The patch 0f87d9d3: "mm/page_alloc: add an array-based interface
  to the bulk page allocator" from Apr 29, 2021, leads to the following
  static checker warning:

        mm/page_alloc.c:5338 __alloc_pages_bulk()
        warn: potentially one past the end of array 'page_array[nr_populated]'

The problem can occur if an array is passed in that is fully populated.
That potentially ends up allocating a single page and storing it past
the end of the array.  This patch returns 0 if the array is fully
populated.

Link: https://lkml.kernel.org/r/20210618125102.GU30378@techsingularity.net
Fixes: 0f87d9d3 ("mm/page_alloc: add an array-based interface to the bulk page allocator")
Signed-off-by: NMel Gorman <mgorman@techsinguliarity.net>
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit b3b64ebd)
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>
Reviewed-by: NTong Tiangen <tongtiangen@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>