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tcp: correctly handle increased zerocopy args struct size

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A prior patch increased the size of struct tcp_zerocopy_receive
but did not update do_tcp_getsockopt() handling to properly account
for this.

This patch simply reintroduces content erroneously cut from the
referenced prior patch that handles the new struct size.

Fixes: 18fb76ed5386 ("net-zerocopy: Copy straggler unaligned data for TCP Rx. zerocopy.")
Signed-off-by: Arjun Roy <arjunroy@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arjun Roy 2020-12-10 11:16:03 -08:00 committed by David S. Miller
parent a76b6b1fe8
commit e0fecb289a
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/tcp.c
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@ -4082,7 +4082,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
}
#ifdef CONFIG_MMU
case TCP_ZEROCOPY_RECEIVE: {
struct tcp_zerocopy_receive zc;
struct tcp_zerocopy_receive zc = {};
int err;
if (get_user(len, optlen))
@ -4099,7 +4099,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
lock_sock(sk);
err = tcp_zerocopy_receive(sk, &zc);
release_sock(sk);
if (len == sizeof(zc))
if (len >= offsetofend(struct tcp_zerocopy_receive, err))
goto zerocopy_rcv_sk_err;
switch (len) {
case offsetofend(struct tcp_zerocopy_receive, err):