netdev - Minor bugs in sctp

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Date:   Wed, 20 May 2020 14:57:07 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
        "'Marcelo Ricardo Leitner'" <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>
Subject: Minor bugs in sctp_getsockopt()

I've found 2 minor bugs in sctp_getsockopt().

sctp_getsockopt_peer_auth_chunks() fails to allow for the header
structure when checking the length of the user buffer.
So it can write beyond the end of the user buffer.

sctp_getsockopt_pr_streamstatus() fails to do the copy_to_user()
when streamoute is NULL.

I found these in the middle of writing another patch.
So generating the patch is tricky.

	David

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