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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        syzbot+aed06913f36eff9b544e@syzkaller.appspotmail.com,
        Rustam Kovhaev <rkovhaev@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Anton Altaparmakov <anton@tuxera.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 109/139] ntfs: add check for mft record size in superblock
Date:   Tue, 27 Oct 2020 14:50:03 +0100
Message-Id: <20201027134907.315253914@linuxfoundation.org>
In-Reply-To: <20201027134902.130312227@linuxfoundation.org>
References: <20201027134902.130312227@linuxfoundation.org>
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From: Rustam Kovhaev <rkovhaev@gmail.com>

[ Upstream commit 4f8c94022f0bc3babd0a124c0a7dcdd7547bd94e ]

Number of bytes allocated for mft record should be equal to the mft record
size stored in ntfs superblock as reported by syzbot, userspace might
trigger out-of-bounds read by dereferencing ctx->attr in ntfs_attr_find()

Reported-by: syzbot+aed06913f36eff9b544e@syzkaller.appspotmail.com
Signed-off-by: Rustam Kovhaev <rkovhaev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: syzbot+aed06913f36eff9b544e@syzkaller.appspotmail.com
Acked-by: Anton Altaparmakov <anton@tuxera.com>
Link: https://syzkaller.appspot.com/bug?extid=aed06913f36eff9b544e
Link: https://lkml.kernel.org/r/20200824022804.226242-1-rkovhaev@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ntfs/inode.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 7c410f8794124..2aa073b82d30f 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -1844,6 +1844,12 @@ int ntfs_read_inode_mount(struct inode *vi)
 		brelse(bh);
 	}
 
+	if (le32_to_cpu(m->bytes_allocated) != vol->mft_record_size) {
+		ntfs_error(sb, "Incorrect mft record size %u in superblock, should be %u.",
+				le32_to_cpu(m->bytes_allocated), vol->mft_record_size);
+		goto err_out;
+	}
+
 	/* Apply the mst fixups. */
 	if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) {
 		/* FIXME: Try to use the $MFTMirr now. */
-- 
2.25.1