Linux 2.2 DoS attack

From: Alan Cox (alanat_private)
Date: Tue Jun 01 1999 - 15:30:33 PDT

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    Ok problem confirmed. Its not icmp however - in fact the program given
has some bugs that cause it. If it had been a correctly written icmp tester
it wouldnt have worked. A blessing in disguise.

Anyway the fix seems to be this. Sorry it took so long to sort out.


--- ../linux.vanilla/net/ipv4/ip_options.c	Wed May 12 16:49:38 1999
+++ net/ipv4/ip_options.c	Tue Jun  1 22:11:46 1999
@@ -452,7 +452,6 @@
 error:
 	if (skb) {
 		icmp_send(skb, ICMP_PARAMETERPROB, 0, htonl((pp_ptr-iph)<<24));
-		kfree_skb(skb);
 	}
 	return -EINVAL;
 }

Alan

    This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 14:48:02 PDT