linux-kernel - [PATCH] fs/ntfs3: Fix memory leak in ntfs_fill

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Date:   Sun, 17 Sep 2023 02:58:52 +0900
From:   Shigeru Yoshida <syoshida@...hat.com>
To:     almaz.alexandrovich@...agon-software.com
Cc:     ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Shigeru Yoshida <syoshida@...hat.com>,
        syzbot+9ccdd15480e9d9833822@...kaller.appspotmail.com
Subject: [PATCH] fs/ntfs3: Fix memory leak in ntfs_fill_super()

syzbot reported memory leak in ntfs_fill_super(). ntfs_fill_super() calls
wnd_init() and this allocates memory. So, we need to free those memory on the
error handling path in ntfs_fill_super().

Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block")
Reported-and-tested-by: syzbot+9ccdd15480e9d9833822@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=9ccdd15480e9d9833822
Signed-off-by: Shigeru Yoshida <syoshida@...hat.com>
---
 fs/ntfs3/super.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index cfec5e0c7f66..a9610f5f4cc0 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -1563,6 +1563,13 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	iput(inode);
 out:
 	kfree(boot2);
+
+	if (sbi->mft.bitmap.inited)
+		wnd_close(&sbi->mft.bitmap);
+
+	if (sbi->used.bitmap.inited)
+		wnd_close(&sbi->used.bitmap);
+
 	return err;
 }
 
-- 
2.41.0