From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 08DF5425882; Thu, 16 Jul 2026 14:26:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784211996; cv=none; b=GONIlJu5TUTkhFrOMSCKNae7F/LqfTgOaplaMmGQG9n0LJCYUsOk82h63VTIEqm27VjdGDeFy7sNLCzZWZz4g5vZkeHU+tFDg82vQIEMmZc8C4Qu7ZOghfB3AO5KxQoCTxghV4y52iIIYGb5BUxMqdW8aSRYRPfwmO7hzp6UL4E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784211996; c=relaxed/simple; bh=89dM5Ke/LRX6ZOJMBC/TDOmJiFWuxbXRFUgINhmsBTI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S8xtcnW0vhhAgWwAJIARjM61r5cD7b5OZC0szUxoYZ8v+e470B6ipRenuhEMk724Glr3oTTn6kxrM647zrOwB8zQ/OhuCXCgBV9pr0UOrd1PPrRvw5JHYTWv3zHGXtmTLbPvTP6teTS57qx1d+wm1LRmMQnkWxyBBzMbRE3p3Io= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oBl19I+B; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="oBl19I+B" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B6951F000E9; Thu, 16 Jul 2026 14:26:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784211994; bh=2REPC3Etb3pXeOSibF0GkmoGne8+O0ufp3sfJEZx5TU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oBl19I+By/ek80sldaafG6j2ySDKrgdqrRuzcYm77KSSPlYXXcRT/ffk5wwOFk4kp odkHMbTEunZHIcu8MqdGUMciz/sPDJo2aQTrlunuDFFjg4SfSHlYKT44q0Nft6z8TF IBrMmmfWqOPn3X+3okk0Mf0//kcILGhcM5JUaeUc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+c1e9aedbd913fadad617@syzkaller.appspotmail.com, Deepanshu Kartikey , Konstantin Komarov , Sasha Levin Subject: [PATCH 6.12 160/349] fs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked() Date: Thu, 16 Jul 2026 15:31:34 +0200 Message-ID: <20260716133036.961018241@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260716133033.287196923@linuxfoundation.org> References: <20260716133033.287196923@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Deepanshu Kartikey [ Upstream commit d7ea8495fd307b58f8867acd81a1b40075b1d3ba ] When a compressed or sparse attribute has its clusters frame-aligned, vcn is rounded down to the frame start using cmask, which can result in vcn != vcn0. In this case, vcn and vcn0 may reside in different attribute segments. The code already handles the case where vcn is in a different segment by loading its runs before allocation. However, it fails to load runs for vcn0 when vcn0 resides in a different segment than vcn. This causes run_lookup_entry() to return SPARSE_LCN for vcn0 since its segment was never loaded into the in-memory run list, triggering the WARN_ON(1). Fix this by adding a missing check for vcn0 after the existing vcn segment check. If vcn0 falls outside the current segment range [svcn, evcn1), find and load the attribute segment containing vcn0 before performing the run lookup. The following scenario triggers the bug: attr_data_get_block_locked() vcn = vcn0 & cmask <- vcn != vcn0 after frame alignment load runs for vcn segment <- vcn0 segment not loaded! attr_allocate_clusters() <- allocation succeeds run_lookup_entry(vcn0) <- vcn0 not in run -> SPARSE_LCN WARN_ON(1) <- bug fires here! Reported-by: syzbot+c1e9aedbd913fadad617@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=c1e9aedbd913fadad617 Fixes: c380b52f6c57 ("fs/ntfs3: Change new sparse cluster processing") Signed-off-by: Deepanshu Kartikey Signed-off-by: Konstantin Komarov Signed-off-by: Sasha Levin --- fs/ntfs3/attrib.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c index 4390c0e4bfb78a..940a8293abe9c0 100644 --- a/fs/ntfs3/attrib.c +++ b/fs/ntfs3/attrib.c @@ -1044,6 +1044,20 @@ int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn, if (err) goto out; } + + if (vcn0 < svcn || evcn1 <= vcn0) { + struct ATTRIB *attr2; + + attr2 = ni_find_attr(ni, attr_b, &le_b, ATTR_DATA, NULL, + 0, &vcn0, &mi); + if (!attr2) { + err = -EINVAL; + goto out; + } + err = attr_load_runs(attr2, ni, run, NULL); + if (err) + goto out; + } } if (vcn + to_alloc > asize) -- 2.53.0