diff options
| author | Eric Dumazet | 2024-02-27 09:24:10 +0000 |
|---|---|---|
| committer | Jakub Kicinski | 2024-02-28 19:36:40 -0800 |
| commit | bbcf91053bb622c4c26a9bfc998d3b0c59227f10 (patch) | |
| tree | 93be235507dc2296e9f60ff594886f3ca6de5820 | |
| parent | 0598f8f3bb77893a13105d47bb7dfe42f1dc1f4e (diff) | |
inet: do not use RTNL in inet_netconf_get_devconf()
"ip -4 netconf show dev XXXX" no longer acquires RTNL.
Return -ENODEV instead of -EINVAL if no netdev or idev can be found.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240227092411.2315725-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/ipv4/devinet.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index ca75d0fff1d1..f045a34e90b9 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -2205,21 +2205,20 @@ static int inet_netconf_get_devconf(struct sk_buff *in_skb, struct netlink_ext_ack *extack) { struct net *net = sock_net(in_skb->sk); - struct nlattr *tb[NETCONFA_MAX+1]; + struct nlattr *tb[NETCONFA_MAX + 1]; + const struct ipv4_devconf *devconf; + struct in_device *in_dev = NULL; + struct net_device *dev = NULL; struct sk_buff *skb; - struct ipv4_devconf *devconf; - struct in_device *in_dev; - struct net_device *dev; int ifindex; int err; err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack); if (err) - goto errout; + return err; - err = -EINVAL; if (!tb[NETCONFA_IFINDEX]) - goto errout; + return -EINVAL; ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); switch (ifindex) { @@ -2230,10 +2229,10 @@ static int inet_netconf_get_devconf(struct sk_buff *in_skb, devconf = net->ipv4.devconf_dflt; break; default: - dev = __dev_get_by_index(net, ifindex); - if (!dev) - goto errout; - in_dev = __in_dev_get_rtnl(dev); + err = -ENODEV; + dev = dev_get_by_index(net, ifindex); + if (dev) + in_dev = in_dev_get(dev); if (!in_dev) goto errout; devconf = &in_dev->cnf; @@ -2257,6 +2256,9 @@ static int inet_netconf_get_devconf(struct sk_buff *in_skb, } err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); errout: + if (in_dev) + in_dev_put(in_dev); + dev_put(dev); return err; } @@ -2826,5 +2828,6 @@ void __init devinet_init(void) rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0); rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0); rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, - inet_netconf_dump_devconf, 0); + inet_netconf_dump_devconf, + RTNL_FLAG_DOIT_UNLOCKED); } |