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 81374296BCC; Sun, 7 Jun 2026 10:51:32 +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=1780829493; cv=none; b=qNx7ey+72YvdVVmHfTKvlJdYGAhHIJNhLOoyzUUo7ODvTxxIHrqPkdZocADoc2LTcpAdaQqxwmGgGXzTnuQAQOmKQ9OLCYMoxDUYbICtlWF+GvgWYJ053SOCIkrl9dkVGS8KUlm6DlzMJng6OtNxBj41+U7NtcmMDJ/ZBorutpo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780829493; c=relaxed/simple; bh=DJTBxQTG4tNSB4p3N7+KZ9djm4JcMOZ5QqdarkhqvlU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QgtPXCnknHMSHghr404i9oGAEd9mEEIFBeS1ovJjYyRaDGK0OurA7FekpkzrDTKFp/tgBQJKid4nbdSPH9Mgs4AytoS2dBw9nbTrlwbIf18r0FD7kx21AWr4wlChqVmcRy7qeRopC7g81c8KNIaeOOhvG4xWIvs17GyFQfKZVhs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=KkmRCaXd; 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="KkmRCaXd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A986C1F00893; Sun, 7 Jun 2026 10:51:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780829492; bh=IuNl3B7wwl/KZXJbDwmTS1bpJfXMWlQ9Tj9fENBIuXc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=KkmRCaXdTaWyQUSnnjAVwYnyvEGT4GwpgRFUytwGUjFmVSZOuKmgAuHYMDvdjpjeZ 0eFETa9Y3VhUjeqxmmRw7yr/GqtCZ8tXYDWHfI8MxP/+gFN9xpPWQmDpy45EXkm4WY pdtpLnLSXRjFudI2UiKg/P065HGCR0Y09qRxT6Nk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Johan Hovold Subject: [PATCH 6.12 229/307] USB: serial: mct_u232: fix missing interrupt-in transfer sanity check Date: Sun, 7 Jun 2026 12:00:26 +0200 Message-ID: <20260607095736.118592485@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260607095727.647295505@linuxfoundation.org> References: <20260607095727.647295505@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: Johan Hovold commit 245aba83e3c288e176ed037a1f6b618b09e92ed8 upstream. Add the missing sanity check on the size of interrupt-in transfers to avoid parsing stale or uninitialised slab data (and leaking it to user space). Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/mct_u232.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/usb/serial/mct_u232.c +++ b/drivers/usb/serial/mct_u232.c @@ -543,6 +543,11 @@ static void mct_u232_read_int_callback(s goto exit; } + if (urb->actual_length < 2) { + dev_warn_ratelimited(&port->dev, "short interrupt-in packet\n"); + goto exit; + } + /* * The interrupt-in pipe signals exceptional conditions (modem line * signal changes and errors). data[0] holds MSR, data[1] holds LSR.