linux-kernel - [PATCH v3 2/2] usb: udc: core: Error if req->buf is either from vmalloc or stack

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Date:   Tue, 25 Apr 2017 17:56:12 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Peter Chen <peter.chen@....com>, Roger Quadros <rogerq@...com>,
        Alan Stern <stern@...land.harvard.edu>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Baoyou Xie <baoyou.xie@...aro.org>,
        Sekhar Nori <nsekhar@...com>, William wu <wulf@...k-chips.com>,
        Arnd Bergmann <arnd@...db.de>,
        Chris Bainbridge <chris.bainbridge@...il.com>,
        Wolfram Sang <wsa-dev@...g-engineering.com>,
        Krzysztof Opasiak <k.opasiak@...sung.com>,
        Felix Hädicke <felixhaedicke@....de>,
        Colin Ian King <colin.king@...onical.com>,
        linux-usb@...r.kernel.org (open list:USB SUBSYSTEM),
        clemens@...isch.de, maksim.salau@...il.com
Subject: [PATCH v3 2/2] usb: udc: core: Error if req->buf is either from vmalloc or stack

Check that req->buf is a valid DMA capable address, produce a warning
and return an error if it's either coming from vmalloc space or is an on
stack buffer.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/usb/gadget/udc/core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index efce68e9a8e0..a03aec574f64 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -23,6 +23,7 @@
 #include <linux/list.h>
 #include <linux/err.h>
 #include <linux/dma-mapping.h>
+#include <linux/sched/task_stack.h>
 #include <linux/workqueue.h>
 
 #include <linux/usb/ch9.h>
@@ -798,6 +799,14 @@ int usb_gadget_map_request_by_dev(struct device *dev,
 
 		req->num_mapped_sgs = mapped;
 	} else {
+		if (is_vmalloc_addr(req->buf)) {
+			dev_err(dev, "buffer is not dma capable\n");
+			return -EFAULT;
+		} else if (object_is_on_stack(req->buf)) {
+			dev_err(dev, "buffer is on stack\n");
+			return -EFAULT;
+		}
+
 		req->dma = dma_map_single(dev, req->buf, req->length,
 				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 
-- 
2.9.3