From: Johan Hovold <jhovold@gmail.com>
Date: Tue, 22 Mar 2011 10:12:11 +0000 (+0100)
Subject: USB: cdc-acm: fix potential null-pointer dereference on disconnect
X-Git-Tag: v2.6.39-rc1~85^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7e7797e7f6f7bfab73fca02c65e40eaa5bb9000c;p=pandora-kernel.git

USB: cdc-acm: fix potential null-pointer dereference on disconnect

Fix potential null-pointer exception on disconnect introduced by commit
11ea859d64b69a747d6b060b9ed1520eab1161fe (USB: additional power savings
for cdc-acm devices that support remote wakeup).

Only access acm->dev after making sure it is non-null in control urb
completion handler.

Cc: stable <stable@kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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