From 7c1e8a3817c55d73b27cc29b84075999c8894179 Mon Sep 17 00:00:00 2001 From: Arthur Gautier Date: Mon, 31 Dec 2018 02:10:58 +0000 Subject: 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 Cc: "David S . Miller" Cc: netdev@vger.kernel.org Signed-off-by: Arthur Gautier Reviewed-by: David Ahern Signed-off-by: David S. Miller --- 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 04ba321ae5ce..e258a00b4a3d 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -1826,7 +1826,7 @@ put_tgt_net: 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 8eeec6eb2bd3..93d5ad2b1a69 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -5154,7 +5154,7 @@ put_tgt_net: 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) -- cgit v1.2.3-59-g8ed1b