From: Johan Hovold <johan@kernel.org>
Date: Tue, 3 Jan 2017 15:39:49 +0000 (+0100)
Subject: USB: serial: kobil_sct: fix NULL-deref in write
X-Git-Tag: v3.2.87~130
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a22d4c0086f61db0b46d84760fd072d6fc0b58bb;p=pandora-kernel.git

USB: serial: kobil_sct: fix NULL-deref in write

commit 21ce57840243c7b70fbc1ebd3dceeb70bb6e9e09 upstream.

Fix NULL-pointer dereference in write() should the device lack the
expected interrupt-out endpoint:

Unable to handle kernel NULL pointer dereference at virtual address 00000054
...
PC is at kobil_write+0x144/0x2a0 [kobil_sct]

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
[bwh: Backported to 3.2: add this check to the existing
 usb_serial_driver::attach implementation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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