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Fixed bug #41700 (Call to tcp_listen_dual() should not accept IPv4 listen PCB args)

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sg 2015-02-26 21:23:40 +01:00
parent 2aabe16163
commit a6a92d42f9
1 changed files with 15 additions and 0 deletions
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15
src/core/tcp.c
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@ -591,6 +591,21 @@ struct tcp_pcb *
tcp_listen_dual_with_backlog(struct tcp_pcb *pcb, u8_t backlog) tcp_listen_dual_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
{ {
struct tcp_pcb *lpcb; struct tcp_pcb *lpcb;
struct tcp_pcb_listen *l;
/* Dual listen only works on bound pcbs (or else we cannot check for
duplicate port use. */
if (pcb->local_port == 0) {
return NULL;
}
/* Check that there's noone listening on this port already
(don't check the IP address since we'll set it to ANY */
for(l = tcp_listen_pcbs.listen_pcbs; l != NULL; l = l->next) {
if (l->local_port == pcb->local_port) {
/* this port is already used */
return NULL;
}
}
lpcb = tcp_listen_with_backlog(pcb, backlog); lpcb = tcp_listen_with_backlog(pcb, backlog);
if ((lpcb != NULL) && if ((lpcb != NULL) &&