linux-kernel - [PATCH 3.12 082/122] udp_diag: Fix socket skipping within chain

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Message-Id: <fd09a4de42024767c0fb9ea797e96454b0054130.1424099974.git.jslaby@suse.cz>
Date:	Tue, 17 Feb 2015 12:34:29 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 082/122] udp_diag: Fix socket skipping within chain

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ 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@...dor.apana.org.au>
Acked-by: Pavel Emelyanov <xemul@...allels.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/ipv4/udp_diag.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c
index 7927db0a9279..4a000f1dd757 100644
--- 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;
 
-- 
2.2.2

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