[PATCH 5.15 532/570] batman-adv: reject oversized global TT response buffers

Greg Kroah-Hartman
2026-04-13T16:40:58Z

From: Ruide Cao <caoruide123@gmail.com>

commit 3a359bf5c61d52e7f09754108309d637532164a6 upstream.

batadv_tt_prepare_tvlv_global_data() builds the allocation length for a
global TT response in 16-bit temporaries. When a remote originator
advertises a large enough global TT, the TT payload length plus the VLAN
header offset can exceed 65535 and wrap before kmalloc().

The full-table response path still uses the original TT payload length when
it fills tt_change, so the wrapped allocation is too small and
batadv_tt_prepare_tvlv_global_data() writes past the end of the heap object
before the later packet-size check runs.

Fix this by rejecting TT responses whose TVLV value length cannot fit in
the 16-bit TVLV payload length field.

Fixes: 7ea7b4a14275 ("batman-adv: make the TT CRC logic VLAN specific")
Cc: stable@vger.kernel.org
Reported-by: Yifan Wu <yifanwucs@gmail.com>
Reported-by: Juefei Pu <tomapufckgml@gmail.com>
Co-developed-by: Yuan Tan <yuantan098@gmail.com>
Signed-off-by: Yuan Tan <yuantan098@gmail.com>
Suggested-by: Xin Liu <bird@lzu.edu.cn>
Tested-by: Ren Wei <enjou1224z@gmail.com>
Signed-off-by: Ruide Cao <caoruide123@gmail.com>
Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/batman-adv/translation-table.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -844,8 +844,8 @@ batadv_tt_prepare_tvlv_global_data(struc
{
u16 num_vlan = 0;
u16 num_entries = 0;
- u16 change_offset;
- u16 tvlv_len;
+ u16 tvlv_len = 0;
+ unsigned int change_offset;
struct batadv_tvlv_tt_vlan_data *tt_vlan;
struct batadv_orig_node_vlan *vlan;
u8 *tt_change_ptr;
@@ -863,6 +863,11 @@ batadv_tt_prepare_tvlv_global_data(struc
if (*tt_len < 0)
*tt_len = batadv_tt_len(num_entries);

+ if (change_offset > U16_MAX || *tt_len > U16_MAX - change_offset) {
+ *tt_len = 0;
+ goto out;
+ }
+
tvlv_len = *tt_len;
tvlv_len += change_offset;