Merge tag 'staging-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging and IIO updates from Greg KH:
 "Here is the "big" staging and IIO driver update for 4.15-rc1.

  Lots and lots of little changes, almost all minor code cleanups as the
  Outreachy application process happened during this development cycle.
  Also happened was a lot of IIO driver activity, and the typec USB code
  moving out of staging to drivers/usb (same commits are in the USB tree
  on a persistent branch to not cause merge issues.)

  Overall, it's a wash, I think we added a few hundred more lines than
  removed, but really only a few thousand were modified at all.

  All of these have been in linux-next for a while. There might be a
  merge issue with Al's vfs tree in the pi433 driver (take his changes,
  they are always better), and the media tree with some of the odd
  atomisp cleanups (take the media tree's version)"

* tag 'staging-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (507 commits)
  staging: lustre: add SPDX identifiers to all lustre files
  staging: greybus: Remove redundant license text
  staging: greybus: add SPDX identifiers to all greybus driver files
  staging: ccree: simplify ioread/iowrite
  staging: ccree: simplify registers access
  staging: ccree: simplify error handling logic
  staging: ccree: remove dead code
  staging: ccree: handle limiting of DMA masks
  staging: ccree: copy IV to DMAable memory
  staging: fbtft: remove redundant initialization of buf
  staging: sm750fb: Fix parameter mistake in poke32
  staging: wilc1000: Fix bssid buffer offset in Txq
  staging: fbtft: fb_ssd1331: fix mirrored display
  staging: android: Fix checkpatch.pl error
  staging: greybus: loopback: convert loopback to use generic async operations
  staging: greybus: operation: add private data with get/set accessors
  staging: greybus: loopback: Fix iteration count on async path
  staging: greybus: loopback: Hold per-connection mutex across operations
  staging: greybus/loopback: use ktime_get() for time intervals
  staging: fsl-dpaa2/eth: Extra headroom in RX buffers
  ...

1 files changed, 12 insertions, 7 deletions

diff --git a/drivers/staging/gdm724x/gdm_lte.c b/drivers/staging/gdm724x/gdm_lte.c
index 9ab6ce231f11..0527b0d1c1d0 100644
--- a/drivers/staging/gdm724x/gdm_lte.c
+++ b/drivers/staging/gdm724x/gdm_lte.c
@@ -26,6 +26,7 @@
 #include <linux/icmp.h>
 #include <linux/icmpv6.h>
 #include <linux/uaccess.h>
+#include <linux/errno.h>
 #include <net/ndisc.h>
 
 #include "gdm_lte.h"
@@ -118,6 +119,10 @@ static int gdm_lte_emulate_arp(struct sk_buff *skb_in, u32 nic_type)
 	void *mac_header_data;
 	u32 mac_header_len;
 
+	/* Check for skb->len, discard if empty */
+	if (skb_in->len == 0)
+		return -ENODATA;
+
 	/* Format the mac header so that it can be put to skb */
 	if (ntohs(((struct ethhdr *)skb_in->data)->h_proto) == ETH_P_8021Q) {
 		memcpy(&vlan_eth, skb_in->data, sizeof(struct vlan_ethhdr));
@@ -241,13 +246,13 @@ static int gdm_lte_emulate_ndp(struct sk_buff *skb_in, u32 nic_type)
 	if (ntohs(((struct ethhdr *)skb_in->data)->h_proto) == ETH_P_8021Q) {
 		memcpy(&vlan_eth, skb_in->data, sizeof(struct vlan_ethhdr));
 		if (ntohs(vlan_eth.h_vlan_encapsulated_proto) != ETH_P_IPV6)
-			return -1;
+			return -EPROTONOSUPPORT;
 		mac_header_data = &vlan_eth;
 		mac_header_len = VLAN_ETH_HLEN;
 	} else {
 		memcpy(&eth, skb_in->data, sizeof(struct ethhdr));
 		if (ntohs(eth.h_proto) != ETH_P_IPV6)
-			return -1;
+			return -EPROTONOSUPPORT;
 		mac_header_data = &eth;
 		mac_header_len = ETH_HLEN;
 	}
@@ -255,13 +260,13 @@ static int gdm_lte_emulate_ndp(struct sk_buff *skb_in, u32 nic_type)
 	/* Check if this is IPv6 ICMP packet */
 	ipv6_in = (struct ipv6hdr *)(skb_in->data + mac_header_len);
 	if (ipv6_in->version != 6 || ipv6_in->nexthdr != IPPROTO_ICMPV6)
-		return -1;
+		return -EPROTONOSUPPORT;
 
 	/* Check if this is NDP packet */
 	icmp6_in = (struct icmp6hdr *)(skb_in->data + mac_header_len +
 					sizeof(struct ipv6hdr));
 	if (icmp6_in->icmp6_type == NDISC_ROUTER_SOLICITATION) { /* Check RS */
-		return -1;
+		return -EPROTONOSUPPORT;
 	} else if (icmp6_in->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
 		/* Check NS */
 		u8 icmp_na[sizeof(struct icmp6hdr) +
@@ -305,7 +310,7 @@ static int gdm_lte_emulate_ndp(struct sk_buff *skb_in, u32 nic_type)
 		icmp6_out.icmp6_cksum = icmp6_checksum(&ipv6_out,
 					(u16 *)icmp_na, sizeof(icmp_na));
 	} else {
-		return -1;
+		return -EINVAL;
 	}
 
 	/* Fill the destination mac with source mac of the received packet */
@@ -412,7 +417,7 @@ static int gdm_lte_tx(struct sk_buff *skb, struct net_device *dev)
 	nic_type = gdm_lte_tx_nic_type(dev, skb);
 	if (nic_type == 0) {
 		netdev_err(dev, "tx - invalid nic_type\n");
-		return -1;
+		return -EMEDIUMTYPE;
 	}
 
 	if (nic_type & NIC_TYPE_ARP) {
@@ -539,7 +544,7 @@ int gdm_lte_event_init(void)
 	}
 
 	pr_err("event init failed\n");
-	return -1;
+	return -ENODATA;
 }
 
 void gdm_lte_event_exit(void)