netdev - [PATCH net] ipv6: Fix dump of specific table with strict checking

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Message-Id: <20190103022613.20263-1-dsahern@kernel.org>
Date:   Wed,  2 Jan 2019 18:26:13 -0800
From:   David Ahern <dsahern@...nel.org>
To:     davem@...emloft.net
Cc:     jakub.kicinski@...ronome.com, netdev@...r.kernel.org,
        David Ahern <dsahern@...il.com>
Subject: [PATCH net] ipv6: Fix dump of specific table with strict checking

From: David Ahern <dsahern@...il.com>

Dump of a specific table with strict checking enabled is looping. The
problem is that the end of the table dump is not marked in the cb. When
dumping a specific table, cb args 0 and 1 are not used (they are the hash
index and entry with an hash table index when dumping all tables). Re-use
args[0] to hold a 'done' flag for the specific table dump.

Fixes: 13e38901d46ca ("net/ipv6: Plumb support for filtering route dumps")
Reported-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Signed-off-by: David Ahern <dsahern@...il.com>
---
 net/ipv6/ip6_fib.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index ae3786132c23..6613d8dbb0e5 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -627,7 +627,11 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
 			return -ENOENT;
 		}
 
-		res = fib6_dump_table(tb, skb, cb);
+		if (!cb->args[0]) {
+			res = fib6_dump_table(tb, skb, cb);
+			if (!res)
+				cb->args[0] = 1;
+		}
 		goto out;
 	}
 
-- 
2.11.0