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[PATCH 4.1 37/46] rbd: fix double free on rbd_dev->header_name

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  [PATCH 4.1 37/46] rbd: fix double free on rbd_dev->header_name Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-23 20:10 +0200

#1254792 — [PATCH 4.1 37/46] rbd: fix double free on rbd_dev->header_name

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

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

From: Ilya Dryomov <idryomov@gmail.com>

commit 3ebe138ac642a195c7f2efdb918f464734421fd6 upstream.

If rbd_dev_image_probe() in rbd_dev_probe_parent() fails, header_name
is freed twice: once in rbd_dev_probe_parent() and then in its caller
rbd_dev_image_probe() (rbd_dev_image_probe() is called recursively to
handle parent images).

rbd_dev_probe_parent() is responsible for probing the parent, so it
shouldn't muck with clone's fields.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/block/rbd.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -5174,7 +5174,6 @@ static int rbd_dev_probe_parent(struct r
 out_err:
 	if (parent) {
 		rbd_dev_unparent(rbd_dev);
-		kfree(rbd_dev->header_name);
 		rbd_dev_destroy(parent);
 	} else {
 		rbd_put_client(rbdc);


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