[PATCH] mm/vmalloc: Fix incorrect size reporting on allocation failure

[Uladzislau Rezki (Sony)]

When __vmalloc_area_node() fails to allocate pages, the failure
message may report an incorrect allocation size, for example:

  vmalloc error: size 0, failed to allocate pages, ...

This happens because the warning prints area->nr_pages * PAGE_SIZE.
At this point, area->nr_pages may be zero or partly populated thus
it is not valid.

Report the originally requested allocation size instead by using
nr_small_pages * PAGE_SIZE, which reflects the actual number of
pages being requested by user.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
---
 mm/vmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 61caa55a4402..a06f4b3ea367 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3901,7 +3901,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 		if (!fatal_signal_pending(current) && page_order == 0)
 			warn_alloc(gfp_mask, NULL,
 				"vmalloc error: size %lu, failed to allocate pages",
-				area->nr_pages * PAGE_SIZE);
+				nr_small_pages * PAGE_SIZE);
 		goto fail;
 	}
 
-- 
2.47.3