@@ -626,12 +626,10 @@ int __netpoll_setup(struct netpoll *np, struct net_device *ndev)
const struct net_device_ops *ops;
int err;
- np->dev = ndev;
- strscpy(np->dev_name, ndev->name, IFNAMSIZ);
-
+ DEBUG_NET_WARN_ON_ONCE(np->dev);
if (ndev->priv_flags & IFF_DISABLE_NETPOLL) {
np_err(np, "%s doesn't support polling, aborting\n",
- np->dev_name);
+ ndev->name);
err = -ENOTSUPP;
goto out;
}
@@ -649,7 +647,7 @@ int __netpoll_setup(struct netpoll *np, struct net_device *ndev)
refcount_set(&npinfo->refcnt, 1);
- ops = np->dev->netdev_ops;
+ ops = ndev->netdev_ops;
if (ops->ndo_netpoll_setup) {
err = ops->ndo_netpoll_setup(ndev, npinfo);
if (err)
@@ -660,6 +658,8 @@ int __netpoll_setup(struct netpoll *np, struct net_device *ndev)
refcount_inc(&npinfo->refcnt);
}
+ np->dev = ndev;
+ strscpy(np->dev_name, ndev->name, IFNAMSIZ);
npinfo->netpoll = np;
/* last thing to do is link it to the net device structure */
@@ -677,6 +677,7 @@ EXPORT_SYMBOL_GPL(__netpoll_setup);
int netpoll_setup(struct netpoll *np)
{
struct net_device *ndev = NULL;
+ bool ip_overwritten = false;
struct in_device *in_dev;
int err;
@@ -740,6 +741,7 @@ int netpoll_setup(struct netpoll *np)
goto put;
}
+ ip_overwritten = true;
np->local_ip.ip = ifa->ifa_local;
np_info(np, "local IP %pI4\n", &np->local_ip.ip);
} else {
@@ -757,6 +759,7 @@ int netpoll_setup(struct netpoll *np)
!!(ipv6_addr_type(&np->remote_ip.in6) & IPV6_ADDR_LINKLOCAL))
continue;
np->local_ip.in6 = ifp->addr;
+ ip_overwritten = true;
err = 0;
break;
}
@@ -787,6 +790,9 @@ int netpoll_setup(struct netpoll *np)
return 0;
put:
+ DEBUG_NET_WARN_ON_ONCE(np->dev);
+ if (ip_overwritten)
+ memset(&np->local_ip, 0, sizeof(np->local_ip));
netdev_put(ndev, &np->dev_tracker);
unlock:
rtnl_unlock();
Modify netpoll_setup() and __netpoll_setup() to ensure that the netpoll structure (np) is left in a clean state if setup fails for any reason. This prevents carrying over misconfigured fields in case of partial setup success. Key changes: - np->dev is now set only after successful setup, ensuring it's always NULL if netpoll is not configured or if netpoll_setup() fails. - np->local_ip is zeroed if netpoll setup doesn't complete successfully. - Added DEBUG_NET_WARN_ON_ONCE() checks to catch unexpected states. - Reordered some operations in __netpoll_setup() for better logical flow. These changes improve the reliability of netpoll configuration, since it assures that the structure is fully initialized or totally unset. Suggested-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Breno Leitao <leitao@debian.org> --- net/core/netpoll.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-)