From: Cathy Avery <cathy.avery@oracle.com>
Date: Fri, 2 Oct 2015 13:35:01 +0000 (-0400)
Subject: xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing)
X-Git-Tag: v3.2.73~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26e6ab3e52ef3f4399bb7e94eb71c553cace88fe;p=pandora-kernel.git

xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing)

commit a54c8f0f2d7df525ff997e2afe71866a1a013064 upstream.

xen-blkfront will crash if the check to talk_to_blkback()
in blkback_changed()(XenbusStateInitWait) returns an error.
The driver data is freed and info is set to NULL. Later during
the close process via talk_to_blkback's call to xenbus_dev_fatal()
the null pointer is passed to and dereference in blkfront_closing.

Signed-off-by: Cathy Avery <cathy.avery@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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