3.8.13.3 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Alex Elder <elder@xxxxxxxxxxx>
commit 7262cfca430a1a0e0707149af29ae86bc0ded230 upstream.
Whether rbd_client_create() successfully creates a new client or
not, it takes responsibility for getting the ceph_opts structure
it's passed destroyed. If successful, the structure becomes
associated with the created client; if not, rbd_client_create()
will destroy it.
Previously, rbd_get_client() would call ceph_destroy_options()
if rbd_get_client() failed, and that meant it got called twice.
That led freeing various pointers more than once, which is never a
good idea.
This resolves:
http://tracker.ceph.com/issues/4559
Reported-by: Dan van der Ster <dan@xxxxxxxxxxxxxx>
Signed-off-by: Alex Elder <elder@xxxxxxxxxxx>
Reviewed-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/block/rbd.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 89576a0..992dd78 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -329,8 +329,8 @@ static const struct block_device_operations rbd_bd_ops = {
};
/*
- * Initialize an rbd client instance.
- * We own *ceph_opts.
+ * Initialize an rbd client instance. Success or not, this function
+ * consumes ceph_opts.
*/
static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts)
{
@@ -469,7 +469,8 @@ static int parse_rbd_opts_token(char *c, void *private)
/*
* Get a ceph client with specific addr and configuration, if one does
- * not exist create it.
+ * not exist create it. Either way, ceph_opts is consumed by this
+ * function.
*/
static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts)
{
@@ -3629,7 +3630,6 @@ static ssize_t rbd_add(struct bus_type *bus,
rc = PTR_ERR(rbdc);
goto err_out_args;
}
- ceph_opts = NULL; /* rbd_dev client now owns this */
/* pick the pool */
osdc = &rbdc->client->osdc;
@@ -3658,8 +3658,6 @@ err_out_rbd_dev:
err_out_client:
rbd_put_client(rbdc);
err_out_args:
- if (ceph_opts)
- ceph_destroy_options(ceph_opts);
kfree(rbd_opts);
rbd_spec_put(spec);
err_out_module:
--
1.8.1.2
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