Date: Mon, 9 Jun 1997 00:49:34 +0000 () From: "Lenzi, Sergio" <lenzi@bsi.com.br> To: freebsd-hackers@freebsd.org Subject: pppd & natd problem turnaround.. Message-ID: <Pine.BSF.3.91.970609004516.1188A-100000@sergio>
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Hello all.
I have seen some messages dealing with pppd & natd panicing FreeBSD 2.2
systems.
The problem arises when a negative m->m_len value is reveived in function
pppfcs in module sys/net/ppp_tty.c
A turnaround is to replace m_len to ZERO whenever is less then zero.
I know it is not the best, but it works for now.
Here is the patch.
--- ppp_tty.old Sat Jun 7 18:10:32 1997
+++ ppp_tty.c Sun Jun 8 21:51:26 1997
@@ -573,7 +573,7 @@
register u_char *cp;
register int len;
{
- while (len--)
+ while (len-- > 0)
fcs = PPP_FCS(fcs, *cp++);
return (fcs);
}
@@ -775,6 +775,8 @@
sc->sc_if.if_obytes = sc->sc_bytessent;
break;
}
+ if (m->m_len < 0)
+ m->m_len=0;
sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
}
Sergio Lenzi.
Unix consult.
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