Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 40/40] mm/vmalloc.c: move area->pages after if statement | Date | Mon, 20 Apr 2020 14:39:50 +0200 |
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From: Austin Kim <austindh.kim@gmail.com>
commit 7ea362427c170061b8822dd41bafaa72b3bcb9ad upstream.
If !area->pages statement is true where memory allocation fails, area is freed.
In this case 'area->pages = pages' should not executed. So move 'area->pages = pages' after if statement.
[akpm@linux-foundation.org: give area->pages the same treatment] Link: http://lkml.kernel.org/r/20190830035716.GA190684@LGEARND20B15 Signed-off-by: Austin Kim <austindh.kim@gmail.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Uladzislau Rezki (Sony) <urezki@gmail.com> Cc: Roman Gushchin <guro@fb.com> Cc: Roman Penyaev <rpenyaev@suse.de> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- mm/vmalloc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
--- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1668,7 +1668,6 @@ static void *__vmalloc_area_node(struct nr_pages = get_vm_area_size(area) >> PAGE_SHIFT; array_size = (nr_pages * sizeof(struct page *)); - area->nr_pages = nr_pages; /* Please note that the recursion is strictly bounded. */ if (array_size > PAGE_SIZE) { pages = __vmalloc_node(array_size, 1, nested_gfp|highmem_mask, @@ -1676,13 +1675,16 @@ static void *__vmalloc_area_node(struct } else { pages = kmalloc_node(array_size, nested_gfp, node); } - area->pages = pages; - if (!area->pages) { + + if (!pages) { remove_vm_area(area->addr); kfree(area); return NULL; } + area->pages = pages; + area->nr_pages = nr_pages; + for (i = 0; i < area->nr_pages; i++) { struct page *page;
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