From 7c1e8a3817c55d73b27cc29b84075999c8894179 Mon Sep 17 00:00:00 2001
From: Arthur Gautier <baloo@gandi.net>
Date: Mon, 31 Dec 2018 02:10:58 +0000
Subject: [PATCH] netlink: fixup regression in RTM_GETADDR
This commit fixes a regression in AF_INET/RTM_GETADDR and
AF_INET6/RTM_GETADDR.
Before this commit, the kernel would stop dumping addresses once the first
skb was full and end the stream with NLMSG_DONE(-EMSGSIZE). The error
shouldn't be sent back to netlink_dump so the callback is kept alive. The
userspace is expected to call back with a new empty skb.
Changes from V1:
- The error is not handled in netlink_dump anymore but rather in
inet_dump_ifaddr and inet6_dump_addr directly as suggested by
David Ahern.
Fixes: d7e38611b81e ("net/ipv4: Put target net when address dump fails due to bad attributes")
Fixes: 242afaa6968c ("net/ipv6: Put target net when address dump fails due to bad attributes")
Cc: David Ahern <dsahern@gmail.com>
Cc: "David S . Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Arthur Gautier <baloo@gandi.net>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv4/devinet.c | 2 +-
net/ipv6/addrconf.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 04ba321ae5cee..e258a00b4a3d6 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1826,7 +1826,7 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
if (fillargs.netnsid >= 0)
put_net(tgt_net);
- return err < 0 ? err : skb->len;
+ return skb->len ? : err;
}
static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 8eeec6eb2bd37..93d5ad2b1a697 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5154,7 +5154,7 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
if (fillargs.netnsid >= 0)
put_net(tgt_net);
- return err < 0 ? err : skb->len;
+ return skb->len ? : err;
}
static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
--
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