md: check for failure when adding pages in alloc_behind_master_bio

alloc_behind_master_bio() can possibly add multiple pages to a bio, but it
is not checking for the return value of bio_add_page() if adding really
succeeded.

Check if the page adding succeeded and if not bail out.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Song Liu <song@kernel.org>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/827aa12d44ebf3f50b41b47f5cedc0f80179f2c1.1685532726.git.johannes.thumshirn@wdc.com
[axboe: fold in s/free_page/put_page fix]
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/raid1.c

@@ -1147,7 +1147,10 @@ static void alloc_behind_master_bio(struct r1bio *r1_bio,
 		if (unlikely(!page))
 			goto free_pages;
 
-		bio_add_page(behind_bio, page, len, 0);
+		if (!bio_add_page(behind_bio, page, len, 0)) {
+			put_page(page);
+			goto free_pages;
+		}
 
 		size -= len;
 		i++;