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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: c14ac9451c ("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>
This commit is contained in:
Alexander Potapenko 2017-03-21 17:14:27 +01:00 committed by David S. Miller
parent 1b33c0d2a1
commit d515684d78
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/udp.c
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@ -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;