tcp: simplify fast open cookie processing

[cascardo/linux.git] / net / ipv4 / tcp_output.c

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 694711a..b20fc02 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -627,7 +627,7 @@ static unsigned int tcp_synack_options(struct sock *sk,
                if (unlikely(!ireq->tstamp_ok))
                        remaining -= TCPOLEN_SACKPERM_ALIGNED;
        }
-       if (foc != NULL) {
+       if (foc != NULL && foc->len >= 0) {
                u32 need = TCPOLEN_EXP_FASTOPEN_BASE + foc->len;
                need = (need + 3) & ~3U;  /* Align to 32 bits */
                if (remaining >= need) {