tree 4efff9df7fab36a2b5989fbe1d7374114fb8e1ab
parent 7c5a48704c3a51084eaa5e5eb74e37c70a710fee
author Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> 1624907623 -0300
committer Karsten Tausche <karsten@fairphone.com> 1645723877 +0100

sctp: validate chunk size in __rcv_asconf_lookup

commit b6ffe7671b24689c09faa5675dd58f93758a97ae upstream.

In one of the fallbacks that SCTP has for identifying an association for an
incoming packet, it looks for AddIp chunk (from ASCONF) and take a peek.
Thing is, at this stage nothing was validating that the chunk actually had
enough content for that, allowing the peek to happen over uninitialized
memory.

Similar check already exists in actual asconf handling in
sctp_verify_asconf().

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: Ibfe53fc724143423353ed6b2984d2508ee4fc457
Issue: FP3SEC-257
(cherry picked from commit 6b5361868870e9a097745446798aa10ee92c159c)