From: Christoph Hellwig <hch@lst.de>
Date: Wed, 13 May 2020 19:36:41 +0000 (+0200)
Subject: ipv6: set msg_control_is_user in do_ipv6_getsockopt
X-Git-Tag: v5.15~3723^2~204
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1b2f08df0a886e0565c71821d5230cba395f5c18;p=platform%2Fkernel%2Flinux-starfive.git

ipv6: set msg_control_is_user in do_ipv6_getsockopt

While do_ipv6_getsockopt does not call the high-level recvmsg helper,
the msghdr eventually ends up being passed to put_cmsg anyway, and thus
needs msg_control_is_user set to the proper value.

Fixes: 1f466e1f15cf ("net: cleanly handle kernel vs user buffers for ->msg_control")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 18d0540..a0e50cc 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -1075,6 +1075,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 		msg.msg_control = optval;
 		msg.msg_controllen = len;
 		msg.msg_flags = flags;
+		msg.msg_control_is_user = true;
 
 		lock_sock(sk);
 		skb = np->pktoptions;