linux-kernel - [PATCH v2] fs/ntfs: fix BUG_ON of ntfs_read

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Message-Id: <20220623094956.977053-1-xu.xin16@zte.com.cn>
Date:   Thu, 23 Jun 2022 09:49:56 +0000
From:   cgel.zte@...il.com
To:     anton@...era.com, linux-ntfs-dev@...ts.sourceforge.net,
        stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, xu.xin16@....com.cn,
        linux-fsdevel@...r.kernel.org, Zeal Robot <zealci@....com.cn>,
        syzbot+6a5a7672f663cce8b156@...kaller.appspotmail.com,
        Songyi Zhang <zhang.songyi@....com.cn>,
        Yang Yang <yang.yang29@....com.cn>,
        Jiang Xuexin <jiang.xuexin@....com.cn>,
        Zhang wenya <zhang.wenya1@....com.cn>
Subject: [PATCH v2] fs/ntfs: fix BUG_ON of ntfs_read_block()

From: xu xin <xu.xin16@....com.cn>

As the bug description at
https://lore.kernel.org/lkml/20220623033635.973929-1-xu.xin16@zte.com.cn/
attckers can use this bug to crash the system.

So to avoid panic, remove the BUG_ON, and use ntfs_warning to output a
warning to the syslog and return instead until someone really solve
the problem.

Cc: stable@...r.kernel.org
Reported-by: Zeal Robot <zealci@....com.cn>
Reported-by: syzbot+6a5a7672f663cce8b156@...kaller.appspotmail.com
Reviewed-by: Songyi Zhang <zhang.songyi@....com.cn>
Reviewed-by: Yang Yang <yang.yang29@....com.cn>
Reviewed-by: Jiang Xuexin<jiang.xuexin@....com.cn>
Reviewed-by: Zhang wenya<zhang.wenya1@....com.cn>
Signed-off-by: xu xin <xu.xin16@....com.cn>
---

Change for v2:
 - Use ntfs_warning instead of WARN().
 - Add the tag Cc: stable@...r.kernel.org.
---
 fs/ntfs/aops.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 5f4fb6ca6f2e..84d68efb4ace 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -183,7 +183,12 @@ static int ntfs_read_block(struct page *page)
 	vol = ni->vol;
 
 	/* $MFT/$DATA must have its complete runlist in memory at all times. */
-	BUG_ON(!ni->runlist.rl && !ni->mft_no && !NInoAttr(ni));
+	if (unlikely(!ni->runlist.rl && !ni->mft_no && !NInoAttr(ni))) {
+		ntfs_warning(vi->i_sb, "Error because ni->runlist.rl, ni->mft_no, "
+				"and NInoAttr(ni) is null.");
+		unlock_page(page);
+		return -EINVAL;
+	}
 
 	blocksize = vol->sb->s_blocksize;
 	blocksize_bits = vol->sb->s_blocksize_bits;
-- 
2.25.1