sctp: add vtag check in sctp_sf_violation

[ Upstream commit aa0f697e45286a6b5f0ceca9418acf54b9099d99 ]

sctp_sf_violation() is called when processing HEARTBEAT_ACK chunk
in cookie_wait state, and some other places are also using it.

The vtag in the chunk's sctphdr should be verified, otherwise, as
later in chunk length check, it may send abort with the existent
asoc's vtag, which can be exploited by one to cook a malicious
chunk to terminate a SCTP asoc.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index e93aa08d2a787fd336c8232b03bcd9ec5b312984..a4874b55faab14bdd35356f6ee3dd66b09259cbf 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -4561,6 +4561,9 @@ enum sctp_disposition sctp_sf_violation(struct net *net,
 {
        struct sctp_chunk *chunk = arg;
 
+       if (!sctp_vtag_verify(chunk, asoc))
+               return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
+
        /* Make sure that the chunk has a valid length. */
        if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr)))
                return sctp_sf_violation_chunklen(net, ep, asoc, type, arg,