usbnet/cdc_ncm: Don't use stack variables for DMA

The cdc_ncm driver still has a few places where stack variables are
passed to the cdc_ncm_do_request function.  This triggers a stack trace in
lib/dma-debug.c if the CONFIG_DEBUG_DMA_API option is set.

Adjust these calls to pass parameters that have been allocated with
kzalloc.

Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index a03336e086d5ec11423a62b492304c2f00769fc3..f06fb78383a1b865b22c989661a1795f4d7f0368 100644 (file)
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -228,23 +228,40 @@ static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
        if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
 
                if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) {
-                       struct usb_cdc_ncm_ndp_input_size ndp_in_sz;
+                       struct usb_cdc_ncm_ndp_input_size *ndp_in_sz;
+
+                       ndp_in_sz = kzalloc(sizeof(*ndp_in_sz), GFP_KERNEL);
+                       if (!ndp_in_sz) {
+                               err = -ENOMEM;
+                               goto size_err;
+                       }
+
                        err = usb_control_msg(ctx->udev,
                                        usb_sndctrlpipe(ctx->udev, 0),
                                        USB_CDC_SET_NTB_INPUT_SIZE,
                                        USB_TYPE_CLASS | USB_DIR_OUT
                                         | USB_RECIP_INTERFACE,
-                                       0, iface_no, &ndp_in_sz, 8, 1000);
+                                       0, iface_no, ndp_in_sz, 8, 1000);
+                       kfree(ndp_in_sz);
                } else {
-                       __le32 dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
+                       __le32 *dwNtbInMaxSize;
+                       dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize),
+                                       GFP_KERNEL);
+                       if (!dwNtbInMaxSize) {
+                               err = -ENOMEM;
+                               goto size_err;
+                       }
+                       *dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
+
                        err = usb_control_msg(ctx->udev,
                                        usb_sndctrlpipe(ctx->udev, 0),
                                        USB_CDC_SET_NTB_INPUT_SIZE,
                                        USB_TYPE_CLASS | USB_DIR_OUT
                                         | USB_RECIP_INTERFACE,
-                                       0, iface_no, &dwNtbInMaxSize, 4, 1000);
+                                       0, iface_no, dwNtbInMaxSize, 4, 1000);
+                       kfree(dwNtbInMaxSize);
                }
-
+size_err:
                if (err < 0)
                        pr_debug("Setting NTB Input Size failed\n");
        }
@@ -325,19 +342,29 @@ static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
 
        /* set Max Datagram Size (MTU) */
        if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
-               __le16 max_datagram_size;
+               __le16 *max_datagram_size;
                u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
+
+               max_datagram_size = kzalloc(sizeof(*max_datagram_size),
+                               GFP_KERNEL);
+               if (!max_datagram_size) {
+                       err = -ENOMEM;
+                       goto max_dgram_err;
+               }
+
                err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0),
                                USB_CDC_GET_MAX_DATAGRAM_SIZE,
                                USB_TYPE_CLASS | USB_DIR_IN
                                 | USB_RECIP_INTERFACE,
-                               0, iface_no, &max_datagram_size,
+                               0, iface_no, max_datagram_size,
                                2, 1000);
                if (err < 0) {
                        pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
                                                CDC_NCM_MIN_DATAGRAM_SIZE);
+                       kfree(max_datagram_size);
                } else {
-                       ctx->max_datagram_size = le16_to_cpu(max_datagram_size);
+                       ctx->max_datagram_size =
+                               le16_to_cpu(*max_datagram_size);
                        /* Check Eth descriptor value */
                        if (eth_max_sz < CDC_NCM_MAX_DATAGRAM_SIZE) {
                                if (ctx->max_datagram_size > eth_max_sz)
@@ -360,8 +387,10 @@ static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
                                                USB_TYPE_CLASS | USB_DIR_OUT
                                                 | USB_RECIP_INTERFACE,
                                                0,
-                                               iface_no, &max_datagram_size,
+                                               iface_no, max_datagram_size,
                                                2, 1000);
+                       kfree(max_datagram_size);
+max_dgram_err:
                        if (err < 0)
                                pr_debug("SET_MAX_DATAGRAM_SIZE failed\n");
                }