From: Alexander Potapenko <glider@google.com>
Date: Tue, 21 Mar 2017 16:14:27 +0000 (+0100)
Subject: ipv6: make sure to initialize sockc.tsflags before first use
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d515684d78148884d5fc425ba904c50f03844020;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

ipv6: make sure to initialize sockc.tsflags before first use

In the case udp_sk(sk)->pending is AF_INET6, udpv6_sendmsg() would
jump to do_append_data, skipping the initialization of sockc.tsflags.
Fix the problem by moving sockc.tsflags initialization earlier.

The bug was detected with KMSAN.

Fixes: c14ac9451c34 ("sock: enable timestamping using control messages")
Signed-off-by: Alexander Potapenko <glider@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 4e4c401e3bc6..e28082f0a307 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1035,6 +1035,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	ipc6.hlimit = -1;
 	ipc6.tclass = -1;
 	ipc6.dontfrag = -1;
+	sockc.tsflags = sk->sk_tsflags;
 
 	/* destination address check */
 	if (sin6) {
@@ -1159,7 +1160,6 @@ do_udp_sendmsg:
 
 	fl6.flowi6_mark = sk->sk_mark;
 	fl6.flowi6_uid = sk->sk_uid;
-	sockc.tsflags = sk->sk_tsflags;
 
 	if (msg->msg_controllen) {
 		opt = &opt_space;