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authorPatrick McHardy <kaber@trash.net>2007-03-24 22:13:06 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-03-25 18:48:11 -0700
commitd3fa76ee6b4a8dd0efda4e78e96f5b19533b3dea (patch)
treef960e24f323770fd3f26b0b14107cf3b0c0c0024 /net/sched/cls_basic.c
parentc93a882ebe673b5e6da0a70fd433f7517e032d23 (diff)
[NET_SCHED]: cls_basic: fix NULL pointer dereference
cls_basic doesn't allocate tp->root before it is linked into the active classifier list, resulting in a NULL pointer dereference when packets hit the classifier before its ->change function is called. Reported by Chris Madden <chris@reflexsecurity.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/cls_basic.c')
-rw-r--r--net/sched/cls_basic.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index fad08e521c2..70fe36eb66a 100644
--- a/net/sched/cls_basic.c
+++ b/net/sched/cls_basic.c
@@ -81,6 +81,13 @@ static void basic_put(struct tcf_proto *tp, unsigned long f)
static int basic_init(struct tcf_proto *tp)
{
+ struct basic_head *head;
+
+ head = kzalloc(sizeof(*head), GFP_KERNEL);
+ if (head == NULL)
+ return -ENOBUFS;
+ INIT_LIST_HEAD(&head->flist);
+ tp->root = head;
return 0;
}
@@ -176,15 +183,6 @@ static int basic_change(struct tcf_proto *tp, unsigned long base, u32 handle,
}
err = -ENOBUFS;
- if (head == NULL) {
- head = kzalloc(sizeof(*head), GFP_KERNEL);
- if (head == NULL)
- goto errout;
-
- INIT_LIST_HEAD(&head->flist);
- tp->root = head;
- }
-
f = kzalloc(sizeof(*f), GFP_KERNEL);
if (f == NULL)
goto errout;