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| author | Sven Eckelmann <sven@narfation.org> | 2019-08-22 09:55:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-16 09:19:33 +0300 |
| commit | 6c59cb113e8c2082deab865d4ffb694cdfcbf61f (patch) | |
| tree | 0011c5d7087156811cc62fa75dbeb7ecbe896613 /scripts | |
| parent | cffe4e6087e84d42298d4872f7a86afe0065fae2 (diff) | |
| download | linux-6c59cb113e8c2082deab865d4ffb694cdfcbf61f.tar.xz | |
batman-adv: Only read OGM tvlv_len after buffer len check
commit a15d56a60760aa9dbe26343b9a0ac5228f35d445 upstream.
Multiple batadv_ogm_packet can be stored in an skbuff. The functions
batadv_iv_ogm_send_to_if()/batadv_iv_ogm_receive() use
batadv_iv_ogm_aggr_packet() to check if there is another additional
batadv_ogm_packet in the skb or not before they continue processing the
packet.
The length for such an OGM is BATADV_OGM_HLEN +
batadv_ogm_packet->tvlv_len. The check must first check that at least
BATADV_OGM_HLEN bytes are available before it accesses tvlv_len (which is
part of the header. Otherwise it might try read outside of the currently
available skbuff to get the content of tvlv_len.
Fixes: ef26157747d4 ("batman-adv: tvlv - basic infrastructure")
Reported-by: syzbot+355cab184197dbbfa384@syzkaller.appspotmail.com
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Acked-by: Antonio Quartulli <a@unstable.cc>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions