batman-adv: Check for alloc errors when preparing TT local data

commit c2d0f48a13e53b4747704c9e692f5e765e52041a upstream.

batadv_tt_prepare_tvlv_local_data can fail to allocate the memory for the
new TVLV block. The caller is informed about this problem with the returned
length of 0. Not checking this value results in an invalid memory access
when either tt_data or tt_change is accessed.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 7ea7b4a14275 ("batman-adv: make the TT CRC logic VLAN specific")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 7da3f84fff2fd6e98213a8f3489fe171335e3414..c93007d9c40312294bc2acebfef08a8967af23b5 100644 (file)
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -2722,7 +2722,7 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
                                                             &tvlv_tt_data,
                                                             &tt_change,
                                                             &tt_len);
-               if (!tt_len)
+               if (!tt_len || !tvlv_len)
                        goto unlock;
 
                /* Copy the last orig_node's OGM buffer */
@@ -2740,7 +2740,7 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
                                                             &tvlv_tt_data,
                                                             &tt_change,
                                                             &tt_len);
-               if (!tt_len)
+               if (!tt_len || !tvlv_len)
                        goto out;
 
                /* fill the rest of the tvlv with the real TT entries */