linux-kernel - [PATCH] staging: gdm724x: Fix DMA from stack

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Date:   Tue,  9 Feb 2021 20:24:15 +0530
From:   ameynarkhede03@...il.com
To:     gregkh@...uxfoundation.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Amey Narkhede <ameynarkhede03@...il.com>
Subject: [PATCH] staging: gdm724x: Fix DMA from stack

From: Amey Narkhede <ameynarkhede03@...il.com>

Stack allocated buffers cannot be used for DMA
on all architectures so allocate usbdev buffer
using kmalloc().

Signed-off-by: Amey Narkhede <ameynarkhede03@...il.com>
---
 drivers/staging/gdm724x/gdm_usb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/gdm724x/gdm_usb.c b/drivers/staging/gdm724x/gdm_usb.c
index dc4da66c3..50dc463d4 100644
--- a/drivers/staging/gdm724x/gdm_usb.c
+++ b/drivers/staging/gdm724x/gdm_usb.c
@@ -56,7 +56,7 @@ static int gdm_usb_recv(void *priv_dev,

 static int request_mac_address(struct lte_udev *udev)
 {
-	u8 buf[16] = {0,};
+	u8 *buf;
 	struct hci_packet *hci = (struct hci_packet *)buf;
 	struct usb_device *usbdev = udev->usbdev;
 	int actual;
@@ -66,6 +66,10 @@ static int request_mac_address(struct lte_udev *udev)
 	hci->len = gdm_cpu_to_dev16(udev->gdm_ed, 1);
 	hci->data[0] = MAC_ADDRESS;

+	buf = kmalloc(16, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
 	ret = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 2), buf, 5,
 			   &actual, 1000);

--
2.30.0