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batman-adv: avoid keeping false temporary entry 

In the case when a temporary entry is added first and a proper tt entry
is added after that, the temporary tt entry is kept in the orig list.
However the temporary flag is removed at this point, and therefore the
purge function can not find this temporary entry anymore.

Therefore, remove the previous temp entry before adding the new proper
one.

This case can happen if a client behind a given originator moves before
the TT announcement is sent out. Other than that, this case can also be
created by bogus or malicious payload frames for VLANs which are not
existent on the sending originator.

Reported-by: Alessandro Bolletta <alessandro@mediaspot.net>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Acked-by: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
This commit is contained in:
Simon Wunderlich 2015-09-02 20:09:55 +02:00 committed by Antonio Quartulli
parent 437bb0e645
commit a6cb390940
1 changed files with 8 additions and 2 deletions
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10
net/batman-adv/translation-table.c
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@ -1427,9 +1427,15 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
}
/* if the client was temporary added before receiving the first
* OGM announcing it, we have to clear the TEMP flag
* OGM announcing it, we have to clear the TEMP flag. Also,
* remove the previous temporary orig node and re-add it
* if required. If the orig entry changed, the new one which
* is a non-temporary entry is preferred.
*/
common->flags &= ~BATADV_TT_CLIENT_TEMP;
if (common->flags & BATADV_TT_CLIENT_TEMP) {
batadv_tt_global_del_orig_list(tt_global_entry);
common->flags &= ~BATADV_TT_CLIENT_TEMP;
}
/* the change can carry possible "attribute" flags like the
* TT_CLIENT_WIFI, therefore they have to be copied in the