[PATCH 3.12 44/86] catc: Use heap buffer for memory size test

From: Jiri Slaby
Date: Thu May 04 2017 - 05:17:38 EST


From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit 2d6a0e9de03ee658a9adc3bfb2f0ca55dff1e478 upstream.

Allocating USB buffers on the stack is not portable, and no longer
works on x86_64 (with VMAP_STACK enabled as per default).

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Brad Spengler <spender@xxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/net/usb/catc.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/net/usb/catc.c b/drivers/net/usb/catc.c
index bf6e083a9574..57da4c10c695 100644
--- a/drivers/net/usb/catc.c
+++ b/drivers/net/usb/catc.c
@@ -779,7 +779,7 @@ static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id
struct net_device *netdev;
struct catc *catc;
u8 broadcast[6];
- int i, pktsz, ret;
+ int pktsz, ret;

if (usb_set_interface(usbdev,
intf->altsetting->desc.bInterfaceNumber, 1)) {
@@ -843,15 +843,24 @@ static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id
catc->irq_buf, 2, catc_irq_done, catc, 1);

if (!catc->is_f5u011) {
+ u32 *buf;
+ int i;
+
dev_dbg(dev, "Checking memory size\n");

- i = 0x12345678;
- catc_write_mem(catc, 0x7a80, &i, 4);
- i = 0x87654321;
- catc_write_mem(catc, 0xfa80, &i, 4);
- catc_read_mem(catc, 0x7a80, &i, 4);
+ buf = kmalloc(4, GFP_KERNEL);
+ if (!buf) {
+ ret = -ENOMEM;
+ goto fail_free;
+ }
+
+ *buf = 0x12345678;
+ catc_write_mem(catc, 0x7a80, buf, 4);
+ *buf = 0x87654321;
+ catc_write_mem(catc, 0xfa80, buf, 4);
+ catc_read_mem(catc, 0x7a80, buf, 4);

- switch (i) {
+ switch (*buf) {
case 0x12345678:
catc_set_reg(catc, TxBufCount, 8);
catc_set_reg(catc, RxBufCount, 32);
@@ -866,6 +875,8 @@ static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id
dev_dbg(dev, "32k Memory\n");
break;
}
+
+ kfree(buf);

dev_dbg(dev, "Getting MAC from SEEROM.\n");

--
2.12.2