6LoWPAN: use the _safe version of list_for_each

When we kfree(entry) that causes a use-after-free bug so we have to
use list_for_each_entry_safe() safe here.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 8a9dbaa0434f..5dc04890e0c5 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -813,15 +813,17 @@ static void lowpan_dellink(struct net_device *dev, struct list_head *head)
         struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
         struct net_device *real_dev = lowpan_dev->real_dev;
         struct lowpan_dev_record *entry;
+        struct lowpan_dev_record *tmp;
 
         ASSERT_RTNL();
 
         mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
-        list_for_each_entry(entry, &lowpan_devices, list)
+        list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
                 if (entry->ldev == dev) {
                         list_del(&entry->list);
                         kfree(entry);
                 }
+        }
         mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
 
         mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);