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[PATCH 4.2 078/110] xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing)

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  [PATCH 4.2 078/110] xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing) Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-11-06 21:40 +0100

#1264471 — [PATCH 4.2 078/110] xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing)

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Cathy Avery <cathy.avery@oracle.com>

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>

---
 drivers/block/xen-blkfront.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1984,7 +1984,8 @@ static void blkback_changed(struct xenbu
 			break;
 		/* Missed the backend's Closing state -- fallthrough */
 	case XenbusStateClosing:
-		blkfront_closing(info);
+		if (info)
+			blkfront_closing(info);
 		break;
 	}
 }


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