diff options
| author | Rasmus Villemoes <[email protected]> | 2021-06-24 18:40:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2021-06-24 19:40:54 -0700 |
| commit | b08e50dd64489e3997029d204f761cb57a3762d2 (patch) | |
| tree | 2e3cb23ccd9b949e687584e7c3f581ca06feb318 | |
| parent | ea6d0630100b285f059d0a8d8e86f38a46407536 (diff) | |
mm/page_alloc: __alloc_pages_bulk(): do bounds check before accessing array
In the event that somebody would call this with an already fully
populated page_array, the last loop iteration would do an access beyond
the end of page_array.
It's of course extremely unlikely that would ever be done, but this
triggers my internal static analyzer. Also, if it really is not
supposed to be invoked this way (i.e., with no NULL entries in
page_array), the nr_populated<nr_pages check could simply be removed
instead.
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 0f87d9d30f21 ("mm/page_alloc: add an array-based interface to the bulk page allocator")
Signed-off-by: Rasmus Villemoes <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | mm/page_alloc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d1f5de1c1283..7124bb00219d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5053,7 +5053,7 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid, * Skip populated array elements to determine if any pages need * to be allocated before disabling IRQs. */ - while (page_array && page_array[nr_populated] && nr_populated < nr_pages) + while (page_array && nr_populated < nr_pages && page_array[nr_populated]) nr_populated++; /* Use the single page allocator for one page. */ |