tree 44200ab353b999cc5c3b7b6f4877ad936fc98e16
parent e83f312114a01b0a76a85e26a475bc780fd35d23
author Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> 1624907621 -0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1626680695 +0200

sctp: validate from_addr_param return

[ Upstream commit 0c5dc070ff3d6246d22ddd931f23a6266249e3db ]

Ilja reported that, simply putting it, nothing was validating that
from_addr_param functions were operating on initialized memory. That is,
the parameter itself was being validated by sctp_walk_params, but it
doesn't check for types and their specific sizes and it could be a 0-length
one, causing from_addr_param to potentially work over the next parameter or
even uninitialized memory.

The fix here is to, in all calls to from_addr_param, check if enough space
is there for the wanted IP address type.

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>