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 9BEA41F30BB; Wed, 17 Sep 2025 12:49:17 +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=1758113357; cv=none; b=aclIXL8S2gH9ZQZIhq0Wg0CtT+rH2eXgbGf8l0BvUsuiZQTPma5pu17pHAEk26msBjO/FrBhzETsXeIHN2nJUh7t/o4RiCftDHKMGeBgQg+anXFkGcZwmhMheTQwBfr3mut6OlkSBqYj/K3d4SUpJ7cZp+c7ooLwCezyThxFaps= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758113357; c=relaxed/simple; bh=KKgZH497zGYtDtHKLH3vtb6hJiktf07Y3mvIBqlAaR4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=szPFhJiJSLnZGTNrdry14HMocqFQM2RKT3qexPualzV3z9yuKOlMiAKiz6tBVtVX0drpp99fPi2nL39ZQuYhIMQFNJjrvjQnWPm62hp4aGNaAj8QdEdFgX5LzC5sd0HHpgMvWO0fa8wzN8qUnpH1MIPDcqwufIf/m9Yj2JLDTjg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Tt3OYq5p; 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="Tt3OYq5p" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17342C4CEF0; Wed, 17 Sep 2025 12:49:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1758113357; bh=KKgZH497zGYtDtHKLH3vtb6hJiktf07Y3mvIBqlAaR4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Tt3OYq5pTcZdA3iBpTCntcVaKUxBNb705s5GzEm1dr2i5o0y53f0CRvyEVLHPwOp1 rD/JjxCbtZSNtyWaqQrGeb0dW8YBjBzgI4Yk3NWKGiqnTQvps/L5gl+d5xZfoXUk3G TjI99ZBr61VzFjfAPgVmrhqWHgJsSvMySUMlfmpw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chunsheng Luo , Miklos Szeredi Subject: [PATCH 6.12 060/140] fuse: check if copy_file_range() returns larger than requested size Date: Wed, 17 Sep 2025 14:33:52 +0200 Message-ID: <20250917123345.771668612@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250917123344.315037637@linuxfoundation.org> References: <20250917123344.315037637@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 6.12-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 @@ -3295,6 +3295,9 @@ 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;