[Bug 84] Unaligned access in ip_tables.c:ip_packet_match

[bugzilla-daemon@netfilter.org]

https://bugzilla.netfilter.org/cgi-bin/bugzilla/show_bug.cgi?id=84





------- Additional Comments From tv@debian.org  2003-12-26 18:29 -------
This works for me, too.

--- linux-2.4.orig/net/ipv4/netfilter/ip_tables.c	2003-12-26 19:24:46.000000000
+0200
+++ linux-2.4/net/ipv4/netfilter/ip_tables.c	2003-12-26 18:58:30.000000000 +0200
@@ -260,7 +278,11 @@ ipt_do_table(struct sk_buff **pskb,
 	     struct ipt_table *table,
 	     void *userdata)
 {
-	static const char nulldevname[IFNAMSIZ] = { 0 };
+	/* Pointer to nulldevname may be dereferenced as unsigned
+	   long* in ip_packet_match. We need to guarantee
+	   sufficient alignment here. */
+	static const char nulldevname[IFNAMSIZ]
+		__attribute__((__aligned__(__alignof__ (unsigned long))));
 	u_int16_t offset;
 	struct iphdr *ip;
 	void *protohdr;




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