linux-kernel - [PATCH v3] staging: gdm724x: Fix DMA from stack

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Message-Id: <20210210142512.23152-1-ameynarkhede03@gmail.com>
Date:   Wed, 10 Feb 2021 19:55:12 +0530
From:   Amey Narkhede <ameynarkhede03@...il.com>
To:     gregkh@...uxfoundation.org, dan.carpenter@...cle.com
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Amey Narkhede <ameynarkhede03@...il.com>
Subject: [PATCH v3] staging: gdm724x: Fix DMA from stack

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

Signed-off-by: Amey Narkhede <ameynarkhede03@...il.com>
---
Changes in v3:
	- Remove superfluous buf pointer
	- Reduce size of allocation of hci_packet to match number of
	bytes used for DMA

 drivers/staging/gdm724x/gdm_usb.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/gdm724x/gdm_usb.c b/drivers/staging/gdm724x/gdm_usb.c
index dc4da66c3..80c58a3ef 100644
--- a/drivers/staging/gdm724x/gdm_usb.c
+++ b/drivers/staging/gdm724x/gdm_usb.c
@@ -56,20 +56,24 @@ static int gdm_usb_recv(void *priv_dev,

 static int request_mac_address(struct lte_udev *udev)
 {
-	u8 buf[16] = {0,};
-	struct hci_packet *hci = (struct hci_packet *)buf;
+	struct hci_packet *hci;
 	struct usb_device *usbdev = udev->usbdev;
 	int actual;
 	int ret = -1;

+	hci = kmalloc(5, GFP_KERNEL);
+	if (!hci)
+		return -ENOMEM;
+
 	hci->cmd_evt = gdm_cpu_to_dev16(udev->gdm_ed, LTE_GET_INFORMATION);
 	hci->len = gdm_cpu_to_dev16(udev->gdm_ed, 1);
 	hci->data[0] = MAC_ADDRESS;

-	ret = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 2), buf, 5,
+	ret = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 2), &hci, 5,
 			   &actual, 1000);

 	udev->request_mac_addr = 1;
+	kfree(hci);

 	return ret;
 }
--
2.30.1