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batman-adv: tt: prevent TVLV OOB check overflow

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commit 7a581d9aab upstream.

A TT unicast TVLV contains the number of VLANs stored in it. This number is
an u16 and gets multiplied by the size of the struct
batadv_tvlv_tt_vlan_data (8 bytes). The size can therefore overflow the u16
used to store the tt_vlan_len. All additional safety checks to prevent
out-of-bounds access of the TVLV buffer are invalid due to this overflow.

Using size_t prevents this overflow and ensures that the safety checks
compare against the actual buffer requirements.

Cc: stable@vger.kernel.org
Fixes: 7ea7b4a142 ("batman-adv: make the TT CRC logic VLAN specific")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sven Eckelmann
2026-07-24 16:03:34 +02:00
committed by Greg Kroah-Hartman
parent d2148aeee9
commit 604bd5042f
1 changed files with 2 additions and 1 deletions
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net/batman-adv/translation-table.c
+2 -1
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@@ -4101,7 +4101,8 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
u16 tvlv_value_len)
{
struct batadv_tvlv_tt_data *tt_data;
u16 tt_vlan_len, tt_num_entries;
u16 tt_num_entries;
size_t tt_vlan_len;
char tt_flag;
bool ret;