lkml.org 
[lkml]   [2005]   [Nov]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[patch 08/23] [PATCH] [NETFILTER] NAT: Fix module refcount dropping too far
-stable review patch.  If anyone has any objections, please let us know.
------------------

The unknown protocol is used as a fallback when a protocol isn't known.
Hence we cannot handle it failing, so don't set ".me". It's OK, since we
only grab a reference from within the same module (iptable_nat.ko), so we
never take the module refcount from 0 to 1.

Also, remove the "protocol is NULL" test: it's never NULL.

Signed-off-by: Rusty Rusty <rusty@rustcorp.com.au>
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
net/ipv4/netfilter/ip_nat_core.c | 6 ++----
net/ipv4/netfilter/ip_nat_proto_unknown.c | 2 +-
2 files changed, 3 insertions(+), 5 deletions(-)

--- linux-2.6.14.2.orig/net/ipv4/netfilter/ip_nat_core.c
+++ linux-2.6.14.2/net/ipv4/netfilter/ip_nat_core.c
@@ -66,10 +66,8 @@ ip_nat_proto_find_get(u_int8_t protonum)
* removed until we've grabbed the reference */
preempt_disable();
p = __ip_nat_proto_find(protonum);
- if (p) {
- if (!try_module_get(p->me))
- p = &ip_nat_unknown_protocol;
- }
+ if (!try_module_get(p->me))
+ p = &ip_nat_unknown_protocol;
preempt_enable();

return p;
--- linux-2.6.14.2.orig/net/ipv4/netfilter/ip_nat_proto_unknown.c
+++ linux-2.6.14.2/net/ipv4/netfilter/ip_nat_proto_unknown.c
@@ -62,7 +62,7 @@ unknown_print_range(char *buffer, const

struct ip_nat_protocol ip_nat_unknown_protocol = {
.name = "unknown",
- .me = THIS_MODULE,
+ /* .me isn't set: getting a ref to this cannot fail. */
.manip_pkt = unknown_manip_pkt,
.in_range = unknown_in_range,
.unique_tuple = unknown_unique_tuple,
--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-11-22 22:12    [W:0.029 / U:8.392 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site