This is a note to let you know that I've just added the patch titled
nvme_fcloop: disassocate local port structs
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nvme_fcloop-disassocate-local-port-structs.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Apr 9 10:16:32 CEST 2018
From: James Smart <jsmart2021@xxxxxxxxx>
Date: Wed, 29 Nov 2017 16:47:31 -0800
Subject: nvme_fcloop: disassocate local port structs
From: James Smart <jsmart2021@xxxxxxxxx>
[ Upstream commit 6fda20283e55b9d288cd56822ce39fc8e64f2208 ]
The current fcloop driver gets its lport structure from the private
area co-allocated with the fc_localport. All is fine except the
teardown path, which wants to wait on the completion, which is marked
complete by the delete_localport callback performed after
unregister_localport. The issue is, the nvme_fc transport frees the
localport structure immediately after delete_localport is called,
meaning the original routine is trying to wait on a complete that
was just freed.
Change such that a lport struct is allocated coincident with the
addition and registration of a localport. The private area of the
localport now contains just a backpointer to the real lport struct.
Now, the completion can be waited for, and after completing, the
new structure can be kfree'd.
Signed-off-by: James Smart <james.smart@xxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/nvme/target/fcloop.c | 35 +++++++++++++++++++++++++----------
1 file changed, 25 insertions(+), 10 deletions(-)
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -204,6 +204,10 @@ struct fcloop_lport {
struct completion unreg_done;
};
+struct fcloop_lport_priv {
+ struct fcloop_lport *lport;
+};
+
struct fcloop_rport {
struct nvme_fc_remote_port *remoteport;
struct nvmet_fc_target_port *targetport;
@@ -657,7 +661,8 @@ fcloop_nport_get(struct fcloop_nport *np
static void
fcloop_localport_delete(struct nvme_fc_local_port *localport)
{
- struct fcloop_lport *lport = localport->private;
+ struct fcloop_lport_priv *lport_priv = localport->private;
+ struct fcloop_lport *lport = lport_priv->lport;
/* release any threads waiting for the unreg to complete */
complete(&lport->unreg_done);
@@ -697,7 +702,7 @@ static struct nvme_fc_port_template fcte
.max_dif_sgl_segments = FCLOOP_SGL_SEGS,
.dma_boundary = FCLOOP_DMABOUND_4G,
/* sizes of additional private data for data structures */
- .local_priv_sz = sizeof(struct fcloop_lport),
+ .local_priv_sz = sizeof(struct fcloop_lport_priv),
.remote_priv_sz = sizeof(struct fcloop_rport),
.lsrqst_priv_sz = sizeof(struct fcloop_lsreq),
.fcprqst_priv_sz = sizeof(struct fcloop_ini_fcpreq),
@@ -728,11 +733,17 @@ fcloop_create_local_port(struct device *
struct fcloop_ctrl_options *opts;
struct nvme_fc_local_port *localport;
struct fcloop_lport *lport;
- int ret;
+ struct fcloop_lport_priv *lport_priv;
+ unsigned long flags;
+ int ret = -ENOMEM;
+
+ lport = kzalloc(sizeof(*lport), GFP_KERNEL);
+ if (!lport)
+ return -ENOMEM;
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
- return -ENOMEM;
+ goto out_free_lport;
ret = fcloop_parse_options(opts, buf);
if (ret)
@@ -752,23 +763,25 @@ fcloop_create_local_port(struct device *
ret = nvme_fc_register_localport(&pinfo, &fctemplate, NULL, &localport);
if (!ret) {
- unsigned long flags;
-
/* success */
- lport = localport->private;
+ lport_priv = localport->private;
+ lport_priv->lport = lport;
+
lport->localport = localport;
INIT_LIST_HEAD(&lport->lport_list);
spin_lock_irqsave(&fcloop_lock, flags);
list_add_tail(&lport->lport_list, &fcloop_lports);
spin_unlock_irqrestore(&fcloop_lock, flags);
-
- /* mark all of the input buffer consumed */
- ret = count;
}
out_free_opts:
kfree(opts);
+out_free_lport:
+ /* free only if we're going to fail */
+ if (ret)
+ kfree(lport);
+
return ret ? ret : count;
}
@@ -790,6 +803,8 @@ __wait_localport_unreg(struct fcloop_lpo
wait_for_completion(&lport->unreg_done);
+ kfree(lport);
+
return ret;
}
Patches currently in stable-queue which might be from jsmart2021@xxxxxxxxx are
queue-4.15/nvme_fcloop-fix-abort-race-condition.patch
queue-4.15/nvme_fcloop-disassocate-local-port-structs.patch