[NETFILTER]: H.323 helper: fix parser error propagation

[Patrick McHardy <kaber@trash.net>]

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I found the reason for the last crash caused by the PROTOS
testsuite, turns out to be annoyingly simple for the amount
of time I needed to find it.

Please review these two patches, we need to get this fixed
before 2.6.17.


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[NETFILTER]: H.323 helper: fix parser error propagation

The condition "> H323_ERROR_STOP" can never be true since H323_ERROR_STOP
is positive and is the highest possible return code, while real errors are
negative, fix the checks. Also check only abort on real errors in some
spots that were just interpreting any return value != 0 as error.

Fixes crashes caused by use of stale data after a parsing error occured:

BUG: unable to handle kernel paging request at virtual address bfffffff
 printing eip:
c01aa0f8
*pde = 1a801067
*pte = 00000000
Oops: 0000 [#1]
PREEMPT
Modules linked in: ip_nat_h323 ip_conntrack_h323 nfsd exportfs sch_sfq sch_red cls_fw sch_hfsc xt_length ipt_owner xt_MARK iptable_mangle nfs lockd sunrpc pppoe pppoxx
CPU:    0
EIP:    0060:[<c01aa0f8>]    Not tainted VLI
EFLAGS: 00210646   (2.6.17-rc4 #8)
EIP is at memmove+0x19/0x22
eax: d77264e9   ebx: d77264e9   ecx: e88d9b17   edx: d77264e9
esi: bfffffff   edi: bfffffff   ebp: de6a7680   esp: c0349db8
ds: 007b   es: 007b   ss: 0068
Process asterisk (pid: 3765, threadinfo=c0349000 task=da068540)
Stack: <0>00000006 c0349e5e d77264e3 e09a2b4e e09a38a0 d7726052 d7726124 00000491
       00000006 00000006 00000006 00000491 de6a7680 d772601e d7726032 c0349f74
       e09a2dc2 00000006 c0349e5e 00000006 00000000 d76dda28 00000491 c0349f74
Call Trace:
 [<e09a2b4e>] mangle_contents+0x62/0xfe [ip_nat]
 [<e09a2dc2>] ip_nat_mangle_tcp_packet+0xa1/0x191 [ip_nat]
 [<e0a2712d>] set_addr+0x74/0x14c [ip_nat_h323]
 [<e0ad531e>] process_setup+0x11b/0x29e [ip_conntrack_h323]
 [<e0ad534f>] process_setup+0x14c/0x29e [ip_conntrack_h323]
 [<e0ad57bd>] process_q931+0x3c/0x142 [ip_conntrack_h323]
 [<e0ad5dff>] q931_help+0xe0/0x144 [ip_conntrack_h323]
...

Found by the PROTOS c07-h2250v4 testsuite.

Signed-off-by: Patrick McHardy <kaber@trash.net>

---
commit 27ce42efc29f421d4238c426769f057dd384bd14
tree 451c3d3d9b1b2803bf74fe02423372a3afc5f26b
parent f1adad78dd2fc8edaa513e0bde92b4c64340245c
author Patrick McHardy <kaber@trash.net> Mon, 22 May 2006 12:33:36 +0200
committer Patrick McHardy <kaber@trash.net> Mon, 22 May 2006 12:33:36 +0200

 net/ipv4/netfilter/ip_conntrack_helper_h323_asn1.c |   32 +++++++++++---------
 1 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/net/ipv4/netfilter/ip_conntrack_helper_h323_asn1.c b/net/ipv4/netfilter/ip_conntrack_helper_h323_asn1.c
index 355a53a..5f4d114 100644
--- a/net/ipv4/netfilter/ip_conntrack_helper_h323_asn1.c
+++ b/net/ipv4/netfilter/ip_conntrack_helper_h323_asn1.c
@@ -528,14 +528,15 @@ int decode_seq(bitstr_t * bs, field_t * 
 
 			/* Decode */
 			if ((err = (Decoders[son->type]) (bs, son, base,
-							  level + 1)) >
-			    H323_ERROR_STOP)
+							  level + 1)) <
+			    H323_ERROR_NONE)
 				return err;
 
 			bs->cur = beg + len;
 			bs->bit = 0;
 		} else if ((err = (Decoders[son->type]) (bs, son, base,
-							 level + 1)))
+							 level + 1)) <
+			   H323_ERROR_NONE)
 			return err;
 	}
 
@@ -584,8 +585,8 @@ int decode_seq(bitstr_t * bs, field_t * 
 		beg = bs->cur;
 
 		if ((err = (Decoders[son->type]) (bs, son, base,
-						  level + 1)) >
-		    H323_ERROR_STOP)
+						  level + 1)) <
+		    H323_ERROR_NONE)
 			return err;
 
 		bs->cur = beg + len;
@@ -660,17 +661,19 @@ int decode_seqof(bitstr_t * bs, field_t 
 							  i <
 							  effective_count ?
 							  base : NULL,
-							  level + 1)) >
-			    H323_ERROR_STOP)
+							  level + 1)) <
+			    H323_ERROR_NONE)
 				return err;
 
 			bs->cur = beg + len;
 			bs->bit = 0;
 		} else
-		    if ((err = (Decoders[son->type]) (bs, son,
-						      i < effective_count ?
-						      base : NULL,
-						      level + 1)))
+			if ((err = (Decoders[son->type]) (bs, son,
+							  i <
+							  effective_count ?
+							  base : NULL,
+							  level + 1)) <
+			    H323_ERROR_NONE)
 			return err;
 
 		if (base)
@@ -735,13 +738,14 @@ int decode_choice(bitstr_t * bs, field_t
 		}
 		beg = bs->cur;
 
-		if ((err = (Decoders[son->type]) (bs, son, base, level + 1)) >
-		    H323_ERROR_STOP)
+		if ((err = (Decoders[son->type]) (bs, son, base, level + 1)) <
+		    H323_ERROR_NONE)
 			return err;
 
 		bs->cur = beg + len;
 		bs->bit = 0;
-	} else if ((err = (Decoders[son->type]) (bs, son, base, level + 1)))
+	} else if ((err = (Decoders[son->type]) (bs, son, base, level + 1)) <
+		   H323_ERROR_NONE)
 		return err;
 
 	return H323_ERROR_NONE;