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tcp: Make tcp_listen_with_backlog_and_err return NULL if the address/port is already used

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The caller of tcp_listen_with_backlog_and_err() usually check if the return
pcb is NULL before checking the err reason. I think the commit adding
tcp_listen_with_backlog_and_err() accidently change the behavior, Fix it.

Fixes: 98fc82fa7128 ("added function tcp_listen_with_backlog_and_err() to get the error reason when listening fails")
Signed-off-by: Axel Lin <axel.lin@ingics.com>
This commit is contained in:
Axel Lin 2017-01-01 15:41:53 +08:00 committed by Dirk Ziegelmeier
parent edfeab7932
commit 1f3c18fcbe
1 changed files with 1 additions and 0 deletions
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src/core/tcp.c
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@ -684,6 +684,7 @@ tcp_listen_with_backlog_and_err(struct tcp_pcb *pcb, u8_t backlog, err_t *err)
if ((lpcb->local_port == pcb->local_port) &&
ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
/* this address/port is already used */
lpcb = NULL;
res = ERR_USE;
goto done;
}