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 53A5F169AD2; Tue, 16 Jun 2026 16:55:59 +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=1781628960; cv=none; b=DnWpMqONcR5aOyg3yIwsVU8l1aaVpDHfiZqHsPsWfl59iTvuMNjuWCuo5JJIOcRyaVa6OPOtB1sI2S+nq2Ignxe+i+mIRxVoCw1cIqxSkFMDXV4XMWeskh01wITLFc3HYMSvqp38lcBYvDE/8uB9A1sVm2ALlUjJCcFPUnhjrIE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781628960; c=relaxed/simple; bh=jBuim/tnwAJwnhBHhdx8y8PLr9yYtmFCTm0s5kVWPG4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AV9l1TYYm0QRTBQ9vNemz/9y2DThK1xH2z03nUiWnDQS5AzK3HVHdEsDo5uelb/uVvX4r2fJRS8aOE1mXDPXN4KKA6vSpx3p9QkZ+YvDXyeD5H12kzMTLUiZTMPzCrjM6Nn08br0+UxmkQVakJSJWscodlPhLRGBkKbznlpx804= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jSFowmBY; 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="jSFowmBY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57AA61F000E9; Tue, 16 Jun 2026 16:55:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781628959; bh=iWM3KWpStvbZ+EemuG3nvQVos0ucbNWQ1ZhdEcuq6t4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=jSFowmBYgNakSGiP0DafbFTlinRAP7w0s43RrgOQjOdCB9VphTuevD3Ktm8lPp3Te CM7UzU4t1Tv0/GPenc4YtI+RsiAreJg43tdDBOapUYSbvkHdxkoBKp+72oEqWNoXrh sWuqFZeY9rlVBkevWnW3ISVhsyoRvbhl4NFuphMk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Johan Hovold , Sasha Levin Subject: [PATCH 6.6 195/452] USB: serial: digi_acceleport: fix memory corruption with small endpoints Date: Tue, 16 Jun 2026 20:27:02 +0530 Message-ID: <20260616145128.070723428@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145117.796205997@linuxfoundation.org> References: <20260616145117.796205997@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit cb3560e8eab1dfa1cac1ed52631adf8ec6ff2cd5 upstream. Add the missing bulk-out buffer size sanity checks to avoid out-of-bounds memory accesses or slab corruption should a malicious device report smaller buffers than expected. 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: Sasha Levin --- drivers/usb/serial/digi_acceleport.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c index d1dea38505762c..5eac99407c1611 100644 --- a/drivers/usb/serial/digi_acceleport.c +++ b/drivers/usb/serial/digi_acceleport.c @@ -1231,15 +1231,34 @@ static int digi_port_init(struct usb_serial_port *port, unsigned port_num) static int digi_startup(struct usb_serial *serial) { struct digi_serial *serial_priv; + int oob_port_num; int ret; + int i; + + /* + * The port bulk-out buffers must be large enough for header and + * buffered data. + */ + for (i = 0; i < serial->type->num_ports; i++) { + if (serial->port[i]->bulk_out_size < DIGI_OUT_BUF_SIZE + 2) + return -EINVAL; + } + + /* + * The OOB port bulk-out buffer must be large enough for the two + * commands in digi_set_modem_signals(). + */ + oob_port_num = serial->type->num_ports; + if (serial->port[oob_port_num]->bulk_out_size < 8) + return -EINVAL; serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); if (!serial_priv) return -ENOMEM; spin_lock_init(&serial_priv->ds_serial_lock); - serial_priv->ds_oob_port_num = serial->type->num_ports; - serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; + serial_priv->ds_oob_port_num = oob_port_num; + serial_priv->ds_oob_port = serial->port[oob_port_num]; ret = digi_port_init(serial_priv->ds_oob_port, serial_priv->ds_oob_port_num); -- 2.53.0