tree 9fa91acef6ce6a59005a2134a8aec68dcdd2c113
parent d8bcdcb2a161f3a19c7d5014f25b89117a27d6db
author Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> 1624907622 -0300
committer Karsten Tausche <karsten@fairphone.com> 1645723871 +0100

sctp: add size validation when walking chunks

[ Upstream commit 50619dbf8db77e98d821d615af4f634d08e22698 ]

The first chunk in a packet is ensured to be present at the beginning of
sctp_rcv(), as a packet needs to have at least 1 chunk. But the second
one, may not be completely available and ch->length can be over
uninitialized memory.

Fix here is by only trying to walk on the next chunk if there is enough to
hold at least the header, and then proceed with the ch->length validation
that is already there.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Change-Id: Ic2b962d31bc5bd2a0bf8d064deead466d607b605
Issue: FP3SEC-257
(cherry picked from commit c7da1d1ed43a6c2bece0d287e2415adf2868697e)