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[NETFILTER]: Fix crash in ip_nat_pptp 

When an inbound PPTP_IN_CALL_REQUEST packet is received the
PPTP NAT helper uses a NULL pointer in pointer arithmentic to
calculate the offset in the packet which needs to be mangled
and corrupts random memory or crashes.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Patrick McHardy 2006-01-09 16:43:43 -08:00 committed by David S. Miller
parent bb94aa169e
commit 15db34702c
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/netfilter/ip_nat_helper_pptp.c
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@ -315,7 +315,7 @@ pptp_inbound_pkt(struct sk_buff **pskb,
break;
case PPTP_IN_CALL_REQUEST:
/* only need to nat in case PAC is behind NAT box */
break;
return NF_ACCEPT;
case PPTP_WAN_ERROR_NOTIFY:
pcid = &pptpReq->wanerr.peersCallID;
break;