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author | Sven Eckelmann <sven@narfation.org> | 2019-08-22 08:55:36 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-16 08:21:41 +0200 |
commit | 86d5ae21d6b8cac3d6394093d414ffe2abf8877a (patch) | |
tree | 8df51018f836149c35732b13b7caf989ed67f6ef /Documentation | |
parent | 4b5fee457723d983868a8cbc140c85bf13845a95 (diff) | |
download | linux-stable-86d5ae21d6b8cac3d6394093d414ffe2abf8877a.tar.gz linux-stable-86d5ae21d6b8cac3d6394093d414ffe2abf8877a.tar.bz2 linux-stable-86d5ae21d6b8cac3d6394093d414ffe2abf8877a.zip |
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 'Documentation')
0 files changed, 0 insertions, 0 deletions