[PATCH 3/4] f2fs: fix NULL pointer dereference in f2fs_verity_work()

[Chao Yu]

If both compression and fsverity feature is on, generic/572 will
report below NULL pointer dereference bug.

 BUG: kernel NULL pointer dereference, address: 0000000000000018
 RIP: 0010:f2fs_verity_work+0x60/0x90 [f2fs]
 #PF: supervisor read access in kernel mode
 Workqueue: fsverity_read_queue f2fs_verity_work [f2fs]
 RIP: 0010:f2fs_verity_work+0x60/0x90 [f2fs]
 Call Trace:
  process_one_work+0x16c/0x3f0
  worker_thread+0x4c/0x440
  ? rescuer_thread+0x350/0x350
  kthread+0xf8/0x130
  ? kthread_unpark+0x70/0x70
  ret_from_fork+0x35/0x40

There are two issue in f2fs_verity_work():
- it needs to traverse and verify all pages in bio.
- if pages in bio belong to non-compressed cluster, accessing
decompress IO context stored in page private will cause NULL
pointer dereference.

Fix them.

Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
 fs/f2fs/data.c | 35 ++++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 5c5db09324b7..66e49fc1056e 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -187,12 +187,37 @@ static void f2fs_verify_pages(struct page **rpages, unsigned int cluster_size)
 
 static void f2fs_verify_bio(struct bio *bio)
 {
-	struct page *page = bio_first_page_all(bio);
-	struct decompress_io_ctx *dic =
-			(struct decompress_io_ctx *)page_private(page);
+	struct bio_vec *bv;
+	struct bvec_iter_all iter_all;
+	struct decompress_io_ctx *dic, *pdic = NULL;
+
+	bio_for_each_segment_all(bv, bio, iter_all) {
+		struct page *page = bv->bv_page;
+
+		dic = (struct decompress_io_ctx *)page_private(page);
+
+		if (dic) {
+			if (dic != pdic) {
+				f2fs_verify_pages(dic->rpages,
+							dic->cluster_size);
+				f2fs_free_dic(dic);
+				pdic = dic;
+			}
+			continue;
+		}
+		pdic = dic;
 
-	f2fs_verify_pages(dic->rpages, dic->cluster_size);
-	f2fs_free_dic(dic);
+		if (bio->bi_status || PageError(page)) {
+			ClearPageUptodate(page);
+			ClearPageError(page);
+		} else {
+			if (fsverity_verify_page(page))
+				SetPageUptodate(page);
+			else
+				SetPageError(page);
+		}
+		unlock_page(page);
+	}
 }
 #endif
 
-- 
2.18.0.rc1