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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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Cathy Avery 2015-10-02 09:35:01 -04:00 committed by Greg Kroah-Hartman
parent ff19840adc
commit c69cba6c93
1 changed files with 2 additions and 1 deletions
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3
drivers/block/xen-blkfront.c
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@ -1590,7 +1590,8 @@ static void blkback_changed(struct xenbus_device *dev,
break;
/* Missed the backend's Closing state -- fallthrough */
case XenbusStateClosing:
blkfront_closing(info);
if (info)
blkfront_closing(info);
break;
}
}