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 3469B4B128A for ; Thu, 3 Sep 2026 13:48:10 +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=1788443304; cv=none; b=EHpZ9F0sPz2nuqxd6TeW1j+fcpalCjPm6oelDMxeNKxwpKafEnsLB8HkrWWThTCXvt/9qAdzYQi3dEs6RZJ2VeL6kFliItgLWJfeHjv9yxzw0wwpPxR0kCcyq8BGZA9r3SYYG1GueZADbmpk2EldnqLA3bRf5yQ+XyoowiOAAiI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788443304; c=relaxed/simple; bh=P8GO5d2PoPyyUUJbYNpefDeN+xciWgENV4IOz+EozEA=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=WE7QLvG8e7uFCj0v9QVuS2IvX8aUlzCa44Z+bDYJgHEx1ol0pwYLo8Edw8OKHF60tp9UNpCUCjWWAZSxkWs9JmBZzVPz+wM16I+mbKrq2ej4FPKAFRpaBuGTN/C6OcG58hFwDc4qnwxFznAKeDHRv+QnYD7333K1kfdZKbvNKUc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=OeU49/g+; 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="OeU49/g+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EAC461F00A3E; Thu, 3 Sep 2026 13:48:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788443287; bh=2w2Y0z+7Y1B573B5kjR4zIQep+AFpMmMdpXOrsqc1XQ=; h=Subject:To:Cc:From:Date; b=OeU49/g+wxyTRedqv+12oITKumi5chvfdGD+WVUn59XzTHCKCfRRBAiqjK3UDSE4t Uh8A85I6sbx/GxSDBr/Pd5idNmk4PAKxgr+d8ivvZdXmZJd75HI8Sy2++XWeq1zUf7 /nr20gXYj7aszk9rjoeog+ZDbyAWLQR3PeDdSmiM= Subject: FAILED: patch "[PATCH] cifs: fix loff_t underflow in cifs_remap_file_range() when" failed to apply to 5.15-stable tree To: sorenson@redhat.com,linkinjeon@kernel.org,pc@manguebit.org Cc: From: Date: Thu, 03 Sep 2026 15:25:22 +0200 Message-ID: <2026090322-serotonin-marsupial-e485@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 6c322f5cf7476ded7a9a20f7be72462065a03c68 # git commit -s git send-email --to '' --in-reply-to '2026090322-serotonin-marsupial-e485@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 6c322f5cf7476ded7a9a20f7be72462065a03c68 Mon Sep 17 00:00:00 2001 From: Frank Sorenson Date: Sat, 22 Aug 2026 16:55:17 -0500 Subject: [PATCH] cifs: fix loff_t underflow in cifs_remap_file_range() when len == 0 With len == 0 (clone to EOF), the effective length is computed as: len = src_inode->i_size - off; If off > i_size, this is a negative loff_t, corrupting the ByteCount in the FSCTL_DUPLICATE_EXTENTS_TO_FILE request and inverting the range in filemap_write_and_wait_range(). The existing off >= i_size check fires only after the ioctl has already been sent. Snapshot i_size_read() once for both the bounds check and the length calculation, eliminating the TOCTOU and 32-bit torn-read risk. Reject off > src_size with -EINVAL. Treat off == src_size as a no-op, consistent with __generic_remap_file_range_prep(). Fixes: 04b38d601239 ("vfs: pull btrfs clone API to vfs layer") Cc: stable@vger.kernel.org Signed-off-by: Frank Sorenson Reviewed-by: Namjae Jeon Signed-off-by: Paulo Alcantara diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c index 2073b29ff969..7ecd70efdfea 100644 --- a/fs/smb/client/cifsfs.c +++ b/fs/smb/client/cifsfs.c @@ -1413,8 +1413,19 @@ static loff_t cifs_remap_file_range(struct file *src_file, loff_t off, */ lock_two_nondirectories(target_inode, src_inode); - if (len == 0) - len = src_inode->i_size - off; + if (len == 0) { + loff_t src_size = i_size_read(src_inode); + + if (off > src_size) { + rc = -EINVAL; + goto unlock; + } + len = src_size - off; + if (!len) { + rc = 0; + goto unlock; + } + } cifs_dbg(FYI, "clone range\n");