[PKT_SCHED] ematch: tcf_em_destroy robustness
Make the code in tcf_em_tree_destroy more robust and cleaner:
* Don't need to cast pointer to kfree() or avoid passing NULL.
* After freeing the tree, clear the pointer to avoid possible problems
from repeated free.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/ematch.c b/net/sched/ematch.c
index d421ec7..b29439d 100644
--- a/net/sched/ematch.c
+++ b/net/sched/ematch.c
@@ -409,14 +409,15 @@
if (em->ops) {
if (em->ops->destroy)
em->ops->destroy(tp, em);
- else if (!tcf_em_is_simple(em) && em->data)
- kfree((void *) em->data);
+ else if (!tcf_em_is_simple(em))
+ kfree(em->data);
module_put(em->ops->owner);
}
}
tree->hdr.nmatches = 0;
kfree(tree->matches);
+ tree->matches = NULL;
}
EXPORT_SYMBOL(tcf_em_tree_destroy);