From 3eae0ba8c9b51d83d2293249fb9c82e90fc6dc31 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Wed, 10 Jan 2018 13:00:39 -0800 Subject: [PATCH] netlink: extack needs to be reset each time through loop [ Upstream commit cbbdf8433a5f117b1a2119ea30fc651b61ef7570 ] syzbot triggered the WARN_ON in netlink_ack testing the bad_attr value. The problem is that netlink_rcv_skb loops over the skb repeatedly invoking the callback and without resetting the extack leaving potentially stale data. Initializing each time through avoids the WARN_ON. Fixes: 2d4bc93368f5a ("netlink: extended ACK reporting") Reported-by: syzbot+315fa6766d0f7c359327@syzkaller.appspotmail.com Signed-off-by: David Ahern Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/netlink/af_netlink.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index aac9d68b4636..f4eb3fe59fe5 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -2393,7 +2393,7 @@ int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *, struct nlmsghdr *, struct netlink_ext_ack *)) { - struct netlink_ext_ack extack = {}; + struct netlink_ext_ack extack; struct nlmsghdr *nlh; int err; @@ -2414,6 +2414,7 @@ int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *, if (nlh->nlmsg_type < NLMSG_MIN_TYPE) goto ack; + memset(&extack, 0, sizeof(extack)); err = cb(skb, nlh, &extack); if (err == -EINTR) goto skip; -- 2.20.1