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 4b519ec35ab76688dcb2fb26371e6a0e625fb7c6..e6260946eafe9255f472b2dce6c5da43b711a5ab 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -4481,6 +4481,9 @@ 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,