net/ipv6: Fix index counter for unicast addresses in in6_dump_addrs

The loop wants to skip previously dumped addresses, so loops until
current index >= saved index. If the message fills it wants to save
the index for the next address to dump - ie., the one that did not
fit in the current message.

Currently, it is incrementing the index counter before comparing to the
saved index, and then the saved index is off by 1 - it assumes the
current address is going to fit in the message.

Change the index handling to increment only after a succesful dump.

Fixes: 502a2ffd7376a ("ipv6: convert idev_list to list macros")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index c63ccce6425fb221170b058e701c11b7ba9a497e..4e81ff2f45882450990e06cb94c84ec34f75c65e 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4928,8 +4928,8 @@ static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
 
                /* unicast address incl. temp addr */
                list_for_each_entry(ifa, &idev->addr_list, if_list) {
-                       if (++ip_idx < s_ip_idx)
-                               continue;
+                       if (ip_idx < s_ip_idx)
+                               goto next;
                        err = inet6_fill_ifaddr(skb, ifa,
                                                NETLINK_CB(cb->skb).portid,
                                                cb->nlh->nlmsg_seq,
@@ -4938,6 +4938,8 @@ static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
                        if (err < 0)
                                break;
                        nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+next:
+                       ip_idx++;
                }
                break;
        }