We cannot reliable calculate packet size on MSG_MORE corked sockets
and thus cannot decide if they are going to be fragmented later on,
so better not use CHECKSUM_PARTIAL in the first place.

Cc: Eric Dumazet <edumazet@google.com>
Cc: Vlad Yasevich <redacted>
Cc: Benjamin Coddington <redacted>
Cc: Tom Herbert <redacted>
Signed-off-by: Hannes Frederic Sowa <redacted>
---
 net/ipv4/ip_output.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 50e2973..0b02417 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c

@@ -911,6 +911,7 @@ static int __ip_append_data(struct sock *sk,
        if (transhdrlen &&
            length + fragheaderlen <= mtu &&
            rt->dst.dev->features & NETIF_F_V4_CSUM &&
+           !(flags & MSG_MORE) &&