linux-kernel - [PATCH 4.9 41/60] misc: mic: double free on ioctl error path

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Message-Id: <20170619151646.167720745@linuxfoundation.org>
Date:   Mon, 19 Jun 2017 23:17:35 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH 4.9 41/60] misc: mic: double free on ioctl error path

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

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 816c9311f1144a03da1fdc4feb2f6b0d3299fca0 upstream.

This function only has one caller.  Freeing "vdev" here leads to a use
after free bug.  There are several other error paths in this function
but this is the only one which frees "vdev".  It looks like the kfree()
can be safely removed.

Fixes: 61e9c905df78 ("misc: mic: Enable VOP host side functionality")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/misc/mic/vop/vop_vringh.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/misc/mic/vop/vop_vringh.c
+++ b/drivers/misc/mic/vop/vop_vringh.c
@@ -292,7 +292,6 @@ static int vop_virtio_add_device(struct
 	if (ret) {
 		dev_err(vop_dev(vdev), "%s %d err %d\n",
 			__func__, __LINE__, ret);
-		kfree(vdev);
 		return ret;
 	}