netdev - [PATCH] net: inet_diag -- Return error code if protocol handler is missed

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Message-ID: <20121103193034.GF6055@moon>
Date:	Sat, 3 Nov 2012 23:30:34 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	NETDEV <netdev@...r.kernel.org>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: [PATCH] net: inet_diag -- Return error code if protocol handler is
 missed

We've observed that in case if UDP diag module is not
supported in kernel the netlink returns NLMSG_DONE without
notifying a caller that handler is missed.

This patch makes __inet_diag_dump to return error code instead.

So as example it become possible to detect such situation
and handle it gracefully on userspace level.

Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
CC: David Miller <davem@...emloft.net>
CC: Eric Dumazet <eric.dumazet@...il.com>
CC: Pavel Emelyanov <xemul@...allels.com>
---
 net/ipv4/inet_diag.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux-2.6.git/net/ipv4/inet_diag.c
===================================================================
--- linux-2.6.git.orig/net/ipv4/inet_diag.c
+++ linux-2.6.git/net/ipv4/inet_diag.c
@@ -895,13 +895,16 @@ static int __inet_diag_dump(struct sk_bu
 		struct inet_diag_req_v2 *r, struct nlattr *bc)
 {
 	const struct inet_diag_handler *handler;
+	int err = 0;
 
 	handler = inet_diag_lock_handler(r->sdiag_protocol);
 	if (!IS_ERR(handler))
 		handler->dump(skb, cb, r, bc);
+	else
+		err = PTR_ERR(handler);
 	inet_diag_unlock_handler(handler);
 
-	return skb->len;
+	return err ? : skb->len;
 }
 
 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
--
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