From: Arthur Gautier <redacted>
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 <redacted>
Cc: "David S . Miller" <davem@davemloft.net>
Cc: <redacted>
Signed-off-by: Arthur Gautier <redacted>
---
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 608a6f4223fb9..fecd0e7672b5d 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 045597b9a7c05..e3cb53b0ef670 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)
--
2.20.1