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fixed bug #22249: division by zero could occur if a remote host sent a zero mss as TCP option.
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@ -22,6 +22,10 @@ HISTORY
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++ Bugfixes:
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2008-03-26 Simon Goldschmidt
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* tcp_in.c, tcp.c: fixed bug #22249: division by zero could occur if a remote
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host sent a zero mss as TCP option.
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(STABLE-1.3.0)
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@ -509,7 +509,8 @@ tcp_connect(struct tcp_pcb *pcb, struct ip_addr *ipaddr, u16_t port,
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pcb->rcv_wnd = TCP_WND;
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pcb->rcv_ann_wnd = TCP_WND;
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pcb->snd_wnd = TCP_WND;
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/* The send MSS is updated when an MSS option is received. */
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/* As initial send MSS, we use TCP_MSS but limit it to 536.
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The send MSS is updated when an MSS option is received. */
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pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
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#if TCP_CALCULATE_EFF_SEND_MSS
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pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
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@ -991,7 +992,8 @@ tcp_alloc(u8_t prio)
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pcb->rcv_ann_wnd = TCP_WND;
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pcb->tos = 0;
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pcb->ttl = TCP_TTL;
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/* The send MSS is updated when an MSS option is received. */
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/* As initial send MSS, we use TCP_MSS but limit it to 536.
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The send MSS is updated when an MSS option is received. */
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pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
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pcb->rto = 3000 / TCP_SLOW_INTERVAL;
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pcb->sa = 0;
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@ -1331,7 +1331,8 @@ tcp_parseopt(struct tcp_pcb *pcb)
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opts[c + 1] == 0x04) {
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/* An MSS option with the right option length. */
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mss = (opts[c + 2] << 8) | opts[c + 3];
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pcb->mss = mss > TCP_MSS? TCP_MSS: mss;
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/* Limit the mss to the configured TCP_MSS and prevent division by zero */
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pcb->mss = ((mss > TCP_MSS) || (mss == 0)) ? TCP_MSS : mss;
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/* And we are done processing options. */
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break;
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