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Staging: batman-adv: protect against ogm packet overflow by checking table length 

Reported-by: Sam Yeung <sam.cwyeung@gmail.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Marek Lindner 2010-10-19 11:59:13 +02:00 committed by Greg Kroah-Hartman
parent 3c45603024
commit 24fb009bae
1 changed files with 7 additions and 2 deletions
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9
drivers/staging/batman-adv/translation-table.c
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@ -59,6 +59,7 @@ void hna_local_add(struct net_device *soft_iface, uint8_t *addr)
struct hna_global_entry *hna_global_entry;
struct hashtable_t *swaphash;
unsigned long flags;
int required_bytes;
spin_lock_irqsave(&bat_priv->hna_lhash_lock, flags);
hna_local_entry =
@ -74,8 +75,12 @@ void hna_local_add(struct net_device *soft_iface, uint8_t *addr)
/* only announce as many hosts as possible in the batman-packet and
space in batman_packet->num_hna That also should give a limit to
MAC-flooding. */
if ((bat_priv->num_local_hna + 1 > (ETH_DATA_LEN - BAT_PACKET_LEN)
/ ETH_ALEN) ||
required_bytes = (bat_priv->num_local_hna + 1) * ETH_ALEN;
required_bytes += BAT_PACKET_LEN;
if ((required_bytes > ETH_DATA_LEN) ||
(atomic_read(&bat_priv->aggregation_enabled) &&
required_bytes > MAX_AGGREGATION_BYTES) ||
(bat_priv->num_local_hna + 1 > 255)) {
bat_dbg(DBG_ROUTES, bat_priv,
"Can't add new local hna entry (%pM): "