[PATCH v3] nilfs2: initialize "struct nilfs_binfo_dat"->bi_pad field

[Tetsuo Handa <penguin-kernel-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>]

nilfs_btree_assign_p() and nilfs_direct_assign_p() are not initializing
"struct nilfs_binfo_dat"->bi_pad field, causing uninit-value reports
when being passed to CRC function.

Reported-by: syzbot <syzbot+048585f3f4227bb2b49b-Pl5Pbv+GP7P466ipTTIvnc23WoclnBCfAL8bYrjMMd8@public.gmane.org>
Link: https://syzkaller.appspot.com/bug?extid=048585f3f4227bb2b49b
Signed-off-by: Tetsuo Handa <penguin-kernel-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>
---
Changes in v3:
  Also fix nilfs_btree_assign_p().

Changes in v2:
  Use memset() for initialization, suggested by Ryusuke Konishi.

 fs/nilfs2/btree.c  | 1 +
 fs/nilfs2/direct.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c
index 2681a449edc1..13592e82eaf6 100644
--- a/fs/nilfs2/btree.c
+++ b/fs/nilfs2/btree.c
@@ -2219,6 +2219,7 @@ static int nilfs_btree_assign_p(struct nilfs_bmap *btree,
 	/* on-disk format */
 	binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
 	binfo->bi_dat.bi_level = level;
+	memset(binfo->bi_dat.bi_pad, 0, sizeof(binfo->bi_dat.bi_pad));
 
 	return 0;
 }
diff --git a/fs/nilfs2/direct.c b/fs/nilfs2/direct.c
index a35f2795b242..4c85914f2abc 100644
--- a/fs/nilfs2/direct.c
+++ b/fs/nilfs2/direct.c
@@ -314,6 +314,7 @@ static int nilfs_direct_assign_p(struct nilfs_bmap *direct,
 
 	binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
 	binfo->bi_dat.bi_level = 0;
+	memset(binfo->bi_dat.bi_pad, 0, sizeof(binfo->bi_dat.bi_pad));
 
 	return 0;
 }
-- 
2.34.1