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 36D7D265CCD; Tue, 30 Sep 2025 14:50:33 +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=1759243833; cv=none; b=nOpT5ULkcdTRAAlq6dmkodTX3q1UaH9B2zMAwhMD2EBUMjfAsmnPGnbvY6VTDDHS3gl+ZamBgprsq2RFk8RXcKab8ENWL5JYTRYHouxAwItSTjoMdQvB5Fn7A7yueCPg5x6hzX4ibl8oFb/hL5insEYgFGVY+1Q3CyHMyZivYNU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759243833; c=relaxed/simple; bh=cJdh8dsYsyQGFcjuaoHbVK5IxRS6xobDGw0QditBokk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SBhyKraOedH7Gw2ITT+QnNXcfYRlbIUhu47ojH8PkTndPFqEQ/zeeTdTAXhkkXBkw6U1SB68GCZC3bSu2FQ1OlPQgAwP6jI8oxnJXDc12BLsK0kPZ3K3GNINoOrVXAXwkjyFV4v9/7DDZvlwtmFwroDIz5QvlCxqhDupDjDQs6M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=K0dEuD7w; 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="K0dEuD7w" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B803C4CEF0; Tue, 30 Sep 2025 14:50:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1759243833; bh=cJdh8dsYsyQGFcjuaoHbVK5IxRS6xobDGw0QditBokk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K0dEuD7wFqYek67SLqzREMQ74L9iEcVz/zF4m4IS9rU/7SAvZJV9MvWyKc3jRmkpg vx5e/EUIA3zSpovlVR9XQnxmMEGNe04YGma6t2jmE29L37bbRehN47/YrQ4vudX4DZ L8g1moMxW9lB8QqwZuPb8+Yk6t/OfZUT3GOdcVyg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chunsheng Luo , Miklos Szeredi Subject: [PATCH 5.4 08/81] fuse: check if copy_file_range() returns larger than requested size Date: Tue, 30 Sep 2025 16:46:10 +0200 Message-ID: <20250930143820.011098196@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250930143819.654157320@linuxfoundation.org> References: <20250930143819.654157320@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 5.4-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 @@ -3365,6 +3365,9 @@ 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;