From: Antonio Quartulli <ordex@autistici.org>
Date: Fri, 6 Jan 2012 20:31:33 +0000 (+0100)
Subject: batman-adv: set TT_CLIENT_NEW flag before invoking hash_add()
X-Git-Tag: firefly_0821_release~3680^2~3338^2~96^2~8
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c40ed2bfa6cc30174d5c547b37bcd6528c830ef4;p=firefly-linux-kernel-4.4.55.git

batman-adv: set TT_CLIENT_NEW flag before invoking hash_add()

In case of a new tt_local_entry, the TT_CLIENT_NEW flag has to be set before
adding such entry to the hash table. Otherwise, it opens a race condition
in which the entry can be found but the flag has not been set.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
---

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 4dc5af334f6b..9be9c41c529b 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -210,6 +210,11 @@ void tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 	if (compare_eth(addr, soft_iface->dev_addr))
 		tt_local_entry->common.flags |= TT_CLIENT_NOPURGE;
 
+	/* The local entry has to be marked as NEW to avoid to send it in
+	 * a full table response going out before the next ttvn increment
+	 * (consistency check) */
+	tt_local_entry->common.flags |= TT_CLIENT_NEW;
+
 	hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig,
 			 &tt_local_entry->common,
 			 &tt_local_entry->common.hash_entry);
@@ -222,11 +227,6 @@ void tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 
 	tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
 
-	/* The local entry has to be marked as NEW to avoid to send it in
-	 * a full table response going out before the next ttvn increment
-	 * (consistency check) */
-	tt_local_entry->common.flags |= TT_CLIENT_NEW;
-
 	/* remove address from global hash if present */
 	tt_global_entry = tt_global_hash_find(bat_priv, addr);