[PATCH 3.18 07/20] udp_diag: Fix socket skipping within chain

Greg Kroah-Hartman
2015-02-25T02:17:03Z

From: Herbert Xu <herbert@gondor.apana.org.au>

[ 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>
---
net/ipv4/udp_diag.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv4/udp_diag.c
+++ b/net/ipv4/udp_diag.c
@@ -99,11 +99,13 @@ static void udp_dump(struct udp_table *t
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;