From: Johan Hovold <johan@kernel.org>
Date: Tue, 31 Jan 2017 16:17:29 +0000 (+0100)
Subject: USB: serial: keyspan_pda: fix receive sanity checks
X-Git-Tag: v3.2.89~68
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b9d711c45a310cd150bddced2604a70115059c2b;p=pandora-kernel.git

USB: serial: keyspan_pda: fix receive sanity checks

commit c528fcb116e61afc379a2e0a0f70906b937f1e2c upstream.

Make sure to check for short transfers before parsing the receive buffer
to avoid acting on stale data.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
[bwh: Backported to 3.2:
 - Adjust context
 - Keep the check for !tty in the data case]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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