| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 25 Jan 2008 15:00:57 -0800
From: Stephen Hemminger <shemminger@...tta.com>
To: David Miller <davem@...emloft.net>, Thomas Graf <tgraf@...g.ch>
Cc: netdev@...r.kernel.org
Subject: [PATCH] tc: oops in em_meta
If userspace passes a unknown match index into em_meta, then em_meta_change
will return an error and the data for the match will not be set. This then
causes an null pointer dereference when the cleanup is done in the error
path via tcf_em_tree_destroy. Since the tree structure comes kzalloc,
it is initialized to NULL.
Discovered when testing a new version of tc command against an accidental
older kernel.
Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
---
Patch against net-2.6.25 tree, should be backported to earlier
stable kernels as well.
--- a/net/sched/em_meta.c 2008-01-25 14:52:08.000000000 -0800
+++ b/net/sched/em_meta.c 2008-01-25 14:52:26.000000000 -0800
@@ -735,11 +735,13 @@ static int em_meta_match(struct sk_buff
static inline void meta_delete(struct meta_match *meta)
{
- struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
+ if (meta) {
+ struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
- if (ops && ops->destroy) {
- ops->destroy(&meta->lvalue);
- ops->destroy(&meta->rvalue);
+ if (ops && ops->destroy) {
+ ops->destroy(&meta->lvalue);
+ ops->destroy(&meta->rvalue);
+ }
}
kfree(meta);
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists