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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@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Florian Fainelli 2017-04-25 17:56:12 -07:00 committed by Greg Kroah-Hartman
parent 4568136620
commit 614536dac7
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/gadget/udc/core.c
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@ -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);