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| author | Florian Fainelli <f.fainelli@gmail.com> | 2017-04-26 03:56:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-17 13:20:53 +0300 |
| commit | 614536dac7f33c64a58fab4767a325d52572a7d1 (patch) | |
| tree | d79ddf1996c4389b65c84dc6b8a3c47e47edc508 /drivers/usb/gadget/udc/core.c | |
| parent | 4568136620c6482bcd4a6b0cd6ae8e5679615d7e (diff) | |
| download | linux-614536dac7f33c64a58fab4767a325d52572a7d1.tar.xz | |
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>
Diffstat (limited to 'drivers/usb/gadget/udc/core.c')
| -rw-r--r-- | drivers/usb/gadget/udc/core.c | 9 |
1 files changed, 9 insertions, 0 deletions
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); |