netdev - [PATCH net-next] ipv4: fix refcount leak in fib_check

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Message-ID: <1439661247.7258.10.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sat, 15 Aug 2015 10:54:07 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Ahern <dsa@...ulusnetworks.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next] ipv4: fix refcount leak in fib_check_nh()

From: Eric Dumazet <edumazet@...gle.com>

fib_lookup() forces FIB_LOOKUP_NOREF flag, while fib_table_lookup()
does not.

This patch solves the typical message at reboot time or device
dismantle :

unregister_netdevice: waiting for eth0 to become free. Usage count = 4

Fixes: 3bfd847203c6 ("net: Use passed in table for nexthop lookups")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: David Ahern <dsa@...ulusnetworks.com>
---
 net/ipv4/fib_semantics.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index b7f1d20a9615..c8025851dac7 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -708,7 +708,8 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
 
 			if (tbl)
 				err = fib_table_lookup(tbl, &fl4, &res,
-						   FIB_LOOKUP_IGNORE_LINKSTATE);
+						       FIB_LOOKUP_IGNORE_LINKSTATE |
+						       FIB_LOOKUP_NOREF);
 			else
 				err = fib_lookup(net, &fl4, &res,
 						 FIB_LOOKUP_IGNORE_LINKSTATE);


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