diff options
| author | Arjun Roy <arjunroy@google.com> | 2020-12-10 11:16:03 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-12-10 13:10:32 -0800 |
| commit | e0fecb289ad3fd2245cdc50bf450b97fcca39884 (patch) | |
| tree | 3e80941720fd71b4783e41c7641ade1d53eb229f /net/ipv4/tcp.c | |
| parent | a76b6b1fe8312905e3f91279f93a4c0cf3b1707c (diff) | |
tcp: correctly handle increased zerocopy args struct size
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>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 3c99d48b65d8..ed42d2193c5c 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -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): |