udp_diag: Fix socket skipping within chain

[ Upstream commit 86f3cddbc3037882414c7308973530167906b7e9 ]

While working on rhashtable walking I noticed that the UDP diag
dumping code is buggy.  In particular, the socket skipping within
a chain never happens, even though we record the number of sockets
that should be skipped.

As this code was supposedly copied from TCP, this patch does what
TCP does and resets num before we walk a chain.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c
index 7927db0..4a000f1 100644 (file)
--- a/net/ipv4/udp_diag.c
+++ b/net/ipv4/udp_diag.c
@@ -99,11 +99,13 @@ static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlin
        s_slot = cb->args[0];
        num = s_num = cb->args[1];
 
-       for (slot = s_slot; slot <= table->mask; num = s_num = 0, slot++) {
+       for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
                struct sock *sk;
                struct hlist_nulls_node *node;
                struct udp_hslot *hslot = &table->hash[slot];
 
+               num = 0;
+
                if (hlist_nulls_empty(&hslot->head))
                        continue;