From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 58AF717BB21; Wed, 17 Sep 2025 13:03:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758114199; cv=none; b=T8XTP7ygktY0EGYkU4S9cBXvmuTASxpouAqJNI6DrUDPLZ/FgEHKO92gKXUiv+qxHwNgwbJf5UoYzGFW9x99+ElUZcL+CR/AXIvI/FTEitH5yuKZPFlCWYvOdGX53mixVpB0NVcUR/VCyJ6kSqFccaZTcl89beHKeMzLehuWFOI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758114199; c=relaxed/simple; bh=mhDb/LgS86DA42tiT9Z9vNVaZ1gTfy5qBbhgPa6083g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NHN/XYkt1ZamFCLR5mI5u0SFTuI60cGB2/PejpHEr2D0ijua8n7l/bDZq+hm2VLp6jq9gr5CyhzXCP7EbXjkMZ21vJnXyv0B4IhMXwfl/ADDn081q3jRPCDFQJOi9BrIlfzG1XUedmZ7GhJq6whTyZIfgk+X1o9HnO3IPdX4JMA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GPLyMgE8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="GPLyMgE8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CBA57C4CEF0; Wed, 17 Sep 2025 13:03:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1758114199; bh=mhDb/LgS86DA42tiT9Z9vNVaZ1gTfy5qBbhgPa6083g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GPLyMgE8Ao1dlgbtu6f6/FLQMSslNvPNObdQOkVNZn4p2oL1VCskXizfyICzXZu9z eneG/HFuaQvWIwIJOxPuG/jfts/uVAks+if+x5dJnFatsAArVyBSBwS9v7RV6gIHoi 5ApCjnmWI4TjgThAGFm6yVa7Wy+mbjZYwv6xOB2I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chunsheng Luo , Miklos Szeredi Subject: [PATCH 6.1 31/78] fuse: check if copy_file_range() returns larger than requested size Date: Wed, 17 Sep 2025 14:34:52 +0200 Message-ID: <20250917123330.323435071@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250917123329.576087662@linuxfoundation.org> References: <20250917123329.576087662@linuxfoundation.org> User-Agent: quilt/0.68 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 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Miklos Szeredi commit e5203209b3935041dac541bc5b37efb44220cc0b upstream. Just like write(), copy_file_range() should check if the return value is less or equal to the requested number of bytes. Reported-by: Chunsheng Luo Closes: https://lore.kernel.org/all/20250807062425.694-1-luochunsheng@ustc.edu/ Fixes: 88bc7d5097a1 ("fuse: add support for copy_file_range()") Cc: # v4.20 Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- fs/fuse/file.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -3169,6 +3169,9 @@ static ssize_t __fuse_copy_file_range(st fc->no_copy_file_range = 1; err = -EOPNOTSUPP; } + if (!err && outarg.size > len) + err = -EIO; + if (err) goto out;