[PATCH 4.14 01/45] bridge/mdb: remove wrong use of NLM_F_MULTI

From: Greg Kroah-Hartman
Date: Wed Sep 18 2019 - 02:20:06 EST


From: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>

[ Upstream commit 94a72b3f024fc7e9ab640897a1e38583a470659d ]

NLM_F_MULTI must be used only when a NLMSG_DONE message is sent at the end.
In fact, NLMSG_DONE is sent only at the end of a dump.

Libraries like libnl will wait forever for NLMSG_DONE.

Fixes: 949f1e39a617 ("bridge: mdb: notify on router port add and del")
CC: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Acked-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/bridge/br_mdb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -373,7 +373,7 @@ static int nlmsg_populate_rtr_fill(struc
struct nlmsghdr *nlh;
struct nlattr *nest;

- nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
+ nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
if (!nlh)
return -EMSGSIZE;