Merge: net: usb: smsc75xx: Fix uninit-value access in __smsc75xx_read_reg

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/3932

JIRA: https://issues.redhat.com/browse/RHEL-28017

CVE: CVE-2023-52528

net: usb: smsc75xx: Fix uninit-value access in __smsc75xx_read_reg

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>

Approved-by: Chris von Recklinghausen <crecklin@redhat.com>
Approved-by: John B. Wyatt IV <jwyatt@redhat.com>

Merged-by: Lucas Zampieri <lzampier@redhat.com>

Author: zampierilucas

drivers/net/usb/smsc75xx.c

@@ -90,7 +90,9 @@ static int __must_check __smsc75xx_read_reg(struct usbnet *dev, u32 index,
 	ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
 		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 		 0, index, &buf, 4);
-	if (unlikely(ret < 0)) {
+	if (unlikely(ret < 4)) {
+		ret = ret < 0 ? ret : -ENODATA;
+
 		netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
 			    index, ret);
 		return ret;