5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Remi Pommarel <repk@xxxxxxxxxxxx>
[ Upstream commit 8038806db64da15721775d6b834990cacbfcf0b2 ]
The number of entries filled by batadv_tt_tvlv_generate() can be less
than initially expected in batadv_tt_prepare_tvlv_{global,local}_data()
(changes can be removed by batadv_tt_local_event() in ADD+DEL sequence
in the meantime as the lock held during the whole tvlv global/local data
generation).
Thus tvlv_len could be bigger than the actual TT entry size that need
to be sent so full table TT_RESPONSE could hold invalid TT entries such
as below.
* 00:00:00:00:00:00 -1 [....] ( 0) 88:12:4e:ad:7e:ba (179) (0x45845380)
* 00:00:00:00:78:79 4092 [.W..] ( 0) 88:12:4e:ad:7e:3c (145) (0x8ebadb8b)
Remove the extra allocated space to avoid sending uninitialized entries
for full table TT_RESPONSE in both batadv_send_other_tt_response() and
batadv_send_my_tt_response().
Fixes: 7ea7b4a14275 ("batman-adv: make the TT CRC logic VLAN specific")
Signed-off-by: Remi Pommarel <repk@xxxxxxxxxxxx>
Signed-off-by: Sven Eckelmann <sven@xxxxxxxxxxxxx>
Signed-off-by: Simon Wunderlich <sw@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/batman-adv/translation-table.c | 37 ++++++++++++++++++------------
1 file changed, 22 insertions(+), 15 deletions(-)
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 0653ae49efd4..e6d51d5070aa 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -2986,14 +2986,16 @@ static bool batadv_tt_global_valid(const void *entry_ptr,
*
* Fills the tvlv buff with the tt entries from the specified hash. If valid_cb
* is not provided then this becomes a no-op.
+ *
+ * Return: Remaining unused length in tvlv_buff.
*/
-static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
- struct batadv_hashtable *hash,
- void *tvlv_buff, u16 tt_len,
- bool (*valid_cb)(const void *,
- const void *,
- u8 *flags),
- void *cb_data)
+static u16 batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
+ struct batadv_hashtable *hash,
+ void *tvlv_buff, u16 tt_len,
+ bool (*valid_cb)(const void *,
+ const void *,
+ u8 *flags),
+ void *cb_data)
{
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tvlv_tt_change *tt_change;
@@ -3007,7 +3009,7 @@ static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
if (!valid_cb)
- return;
+ return tt_len;
rcu_read_lock();
for (i = 0; i < hash->size; i++) {
@@ -3033,6 +3035,8 @@ static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
}
}
rcu_read_unlock();
+
+ return batadv_tt_len(tt_tot - tt_num_entries);
}
/**
@@ -3310,10 +3314,11 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
goto out;
/* fill the rest of the tvlv with the real TT entries */
- batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
- tt_change, tt_len,
- batadv_tt_global_valid,
- req_dst_orig_node);
+ tvlv_len -= batadv_tt_tvlv_generate(bat_priv,
+ bat_priv->tt.global_hash,
+ tt_change, tt_len,
+ batadv_tt_global_valid,
+ req_dst_orig_node);
}
/* Don't send the response, if larger than fragmented packet. */
@@ -3439,9 +3444,11 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
goto out;
/* fill the rest of the tvlv with the real TT entries */
- batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
- tt_change, tt_len,
- batadv_tt_local_valid, NULL);
+ tvlv_len -= batadv_tt_tvlv_generate(bat_priv,
+ bat_priv->tt.local_hash,
+ tt_change, tt_len,
+ batadv_tt_local_valid,
+ NULL);
}
tvlv_tt_data->flags = BATADV_TT_RESPONSE;
--
2.39.5
