linux-kernel - [PATCH 3.4 76/92] xen-blkfront: check for null drvdata in blkback

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Date:	Mon, 18 Apr 2016 18:46:21 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Cathy Avery <cathy.avery@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 76/92] xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing)

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

3.4.112-rc1 review patch.  If anyone has any objections, please let me know.

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


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@...cle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/block/xen-blkfront.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index a81cdd7..16477b2 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1314,7 +1314,8 @@ 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;
 	}
 }
-- 
1.9.1