bridge: add missing bridge port check for offloads

This patch fixes a missing bridge port check caught by smatch.

setlink/dellink of attributes like vlans can come for a bridge device
and there is no need to offload those today. So, this patch adds a bridge
port check. (In these cases however, the BRIDGE_SELF flags will always be set
and we may not hit a problem with the current code).

smatch complaint:

The patch 68e331c785b8: "bridge: offload bridge port attributes to
switch asic if feature flag set" from Jan 29, 2015, leads to the
following Smatch complaint:

net/bridge/br_netlink.c:552 br_setlink()
	 error: we previously assumed 'p' could be null (see line 518)

net/bridge/br_netlink.c
   517
   518		if (p && protinfo) {
                    ^
Check for NULL.

Reported-By: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index b93f42c515da..4fbcea0e7ecb 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -543,7 +543,7 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
                                 afspec, RTM_SETLINK);
         }
 
-        if (!(flags & BRIDGE_FLAGS_SELF)) {
+        if (p && !(flags & BRIDGE_FLAGS_SELF)) {
                 /* set bridge attributes in hardware if supported
                  */
                 ret_offload = netdev_switch_port_bridge_setlink(dev, nlh,
@@ -583,7 +583,7 @@ int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
                  */
                 br_ifinfo_notify(RTM_NEWLINK, p);
 
-        if (!(flags & BRIDGE_FLAGS_SELF)) {
+        if (p && !(flags & BRIDGE_FLAGS_SELF)) {
                 /* del bridge attributes in hardware
                  */
                 ret_offload = netdev_switch_port_bridge_dellink(dev, nlh,