linux-kernel - [PATCH 3.19.y-ckt 164/164] [3.19-stable only] fib_rules: Fix dump

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Message-Id: <1449075615-20754-165-git-send-email-kamal@canonical.com>
Date:	Wed,  2 Dec 2015 09:00:15 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Roland Dreier <roland@...estorage.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 164/164] [3.19-stable only] fib_rules: Fix dump_rules() not to exit early

3.19.8-ckt11 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roland Dreier <roland@...estorage.com>

Backports of 41fc014332d9 ("fib_rules: fix fib rule dumps across
multiple skbs") introduced a regression in "ip rule show" - it ends up
dumping the first rule over and over and never exiting, because 3.19
and earlier are missing commit 053c095a82cf ("netlink: make
nlmsg_end() and genlmsg_end() void"), so fib_nl_fill_rule() ends up
returning skb->len (i.e. > 0) in the success case.

Fix this by checking the return code for < 0 instead of != 0.

Signed-off-by: Roland Dreier <roland@...estorage.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/core/fib_rules.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index aeedc3a..99ae718 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -631,7 +631,7 @@ static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
 		err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
 				       cb->nlh->nlmsg_seq, RTM_NEWRULE,
 				       NLM_F_MULTI, ops);
-		if (err)
+		if (err < 0)
 			break;
 skip:
 		idx++;
-- 
1.9.1

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