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Revert "phonet: no longer hold RTNL in route_dumpit()"

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This reverts commit a8e473f745 which is
commit 58a4ff5d77 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Iaccabecb3c82b59e8bf01e47e9f2b6e0be8c039b
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman 2024-11-07 16:04:19 +00:00 committed by Treehugger Robot
parent 847f07e97f
commit d1697bca8a
1 changed files with 8 additions and 9 deletions
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17
net/phonet/pn_netlink.c
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@ -178,7 +178,7 @@ static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
rtm->rtm_type = RTN_UNICAST;
rtm->rtm_flags = 0;
if (nla_put_u8(skb, RTA_DST, dst) ||
nla_put_u32(skb, RTA_OIF, READ_ONCE(dev->ifindex)))
nla_put_u32(skb, RTA_OIF, dev->ifindex))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;
@ -263,7 +263,6 @@ static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
int err = 0;
u8 addr;
rcu_read_lock();
@ -273,16 +272,16 @@ static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
if (!dev)
continue;
err = fill_route(skb, dev, addr << 2,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, RTM_NEWROUTE);
if (err < 0)
break;
if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, RTM_NEWROUTE) < 0)
goto out;
}
out:
rcu_read_unlock();
cb->args[0] = addr;
return err;
return skb->len;
}
int __init phonet_netlink_register(void)
@ -302,6 +301,6 @@ int __init phonet_netlink_register(void)
rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_DELROUTE,
route_doit, NULL, 0);
rtnl_register_module(THIS_MODULE, PF_PHONET, RTM_GETROUTE,
NULL, route_dumpit, RTNL_FLAG_DUMP_UNLOCKED);
NULL, route_dumpit, 0);
return 0;
}