linux-kernel - [PATCH] nilfs2: initialize "struct nilfs_binfo_dat"->bi

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Date:   Mon, 27 Mar 2023 00:21:46 +0900
From:   Ryusuke Konishi <konishi.ryusuke@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-nilfs@...r.kernel.org,
        syzbot <syzbot+048585f3f4227bb2b49b@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org,
        glider@...gle.com,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Subject: [PATCH] nilfs2: initialize "struct nilfs_binfo_dat"->bi_pad field

From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>

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@...kaller.appspotmail.com>
Link: https://syzkaller.appspot.com/bug?extid=048585f3f4227bb2b49b
Reported-by: Dipanjan Das <mail.dipanjan.das@...il.com>
Link: https://lkml.kernel.org/r/CANX2M5bVbzRi6zH3PTcNE_31TzerstOXUa9Bay4E6y6dX23_pg@mail.gmail.com
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@...il.com>
---
Andrew, please pick this up, a fix for the KMSAN report.

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