tree 6ebcca74bd95f542826d7b65deb03c1f33f333d1
parent 86044244fc6f9eaec0070cb668e0d500de22dbba
author Xin Long <lucien.xin@gmail.com> 1634730165 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1635874006 +0100

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>