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Subject[PATCH 4.18 105/235] ipmi: Rework SMI registration failure
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Corey Minyard <cminyard@mvista.com>

commit 2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2 upstream.

There were certain situations where ipmi_register_smi() would
return a failure, but the interface would still be registered
and would need to be unregistered. This is obviously a bad
design and resulted in an oops in certain failure cases.

If the interface is started up in ipmi_register_smi(), then
an error occurs, shut down the interface there so the
cleanup can be done properly.

Fix the various smi users, too.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reported-by: Justin Ernst <justin.ernst@hpe.com>
Tested-by: Justin Ernst <justin.ernst@hpe.com>
Cc: Andrew Banman <abanman@hpe.com>
Cc: Russ Anderson <russ.anderson@hpe.com>
Cc: <stable@vger.kernel.org> # 4.18.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/char/ipmi/ipmi_msghandler.c | 53 ++++++++++++++++++++----------------
drivers/char/ipmi/ipmi_si_intf.c | 17 ++---------
drivers/char/ipmi/ipmi_ssif.c | 13 ++------
3 files changed, 37 insertions(+), 46 deletions(-)

--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -3381,39 +3381,45 @@ int ipmi_register_smi(const struct ipmi_

rv = handlers->start_processing(send_info, intf);
if (rv)
- goto out;
+ goto out_err;

rv = __bmc_get_device_id(intf, NULL, &id, NULL, NULL, i);
if (rv) {
dev_err(si_dev, "Unable to get the device id: %d\n", rv);
- goto out;
+ goto out_err_started;
}

mutex_lock(&intf->bmc_reg_mutex);
rv = __scan_channels(intf, &id);
mutex_unlock(&intf->bmc_reg_mutex);
+ if (rv)
+ goto out_err_bmc_reg;

- out:
- if (rv) {
- ipmi_bmc_unregister(intf);
- list_del_rcu(&intf->link);
- mutex_unlock(&ipmi_interfaces_mutex);
- synchronize_srcu(&ipmi_interfaces_srcu);
- cleanup_srcu_struct(&intf->users_srcu);
- kref_put(&intf->refcount, intf_free);
- } else {
- /*
- * Keep memory order straight for RCU readers. Make
- * sure everything else is committed to memory before
- * setting intf_num to mark the interface valid.
- */
- smp_wmb();
- intf->intf_num = i;
- mutex_unlock(&ipmi_interfaces_mutex);
+ /*
+ * Keep memory order straight for RCU readers. Make
+ * sure everything else is committed to memory before
+ * setting intf_num to mark the interface valid.
+ */
+ smp_wmb();
+ intf->intf_num = i;
+ mutex_unlock(&ipmi_interfaces_mutex);

- /* After this point the interface is legal to use. */
- call_smi_watchers(i, intf->si_dev);
- }
+ /* After this point the interface is legal to use. */
+ call_smi_watchers(i, intf->si_dev);
+
+ return 0;
+
+ out_err_bmc_reg:
+ ipmi_bmc_unregister(intf);
+ out_err_started:
+ if (intf->handlers->shutdown)
+ intf->handlers->shutdown(intf->send_info);
+ out_err:
+ list_del_rcu(&intf->link);
+ mutex_unlock(&ipmi_interfaces_mutex);
+ synchronize_srcu(&ipmi_interfaces_srcu);
+ cleanup_srcu_struct(&intf->users_srcu);
+ kref_put(&intf->refcount, intf_free);

return rv;
}
@@ -3504,7 +3510,8 @@ void ipmi_unregister_smi(struct ipmi_smi
}
srcu_read_unlock(&intf->users_srcu, index);

- intf->handlers->shutdown(intf->send_info);
+ if (intf->handlers->shutdown)
+ intf->handlers->shutdown(intf->send_info);

cleanup_smi_msgs(intf);

--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2083,18 +2083,9 @@ static int try_smi_init(struct smi_info
si_to_str[new_smi->io.si_type]);

WARN_ON(new_smi->io.dev->init_name != NULL);
- kfree(init_name);
-
- return 0;
-
-out_err:
- if (new_smi->intf) {
- ipmi_unregister_smi(new_smi->intf);
- new_smi->intf = NULL;
- }

+ out_err:
kfree(init_name);
-
return rv;
}

@@ -2227,6 +2218,8 @@ static void shutdown_smi(void *send_info

kfree(smi_info->si_sm);
smi_info->si_sm = NULL;
+
+ smi_info->intf = NULL;
}

/*
@@ -2240,10 +2233,8 @@ static void cleanup_one_si(struct smi_in

list_del(&smi_info->link);

- if (smi_info->intf) {
+ if (smi_info->intf)
ipmi_unregister_smi(smi_info->intf);
- smi_info->intf = NULL;
- }

if (smi_info->pdev) {
if (smi_info->pdev_registered)
--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -1214,18 +1214,11 @@ static void shutdown_ssif(void *send_inf
complete(&ssif_info->wake_thread);
kthread_stop(ssif_info->thread);
}
-
- /*
- * No message can be outstanding now, we have removed the
- * upper layer and it permitted us to do so.
- */
- kfree(ssif_info);
}

static int ssif_remove(struct i2c_client *client)
{
struct ssif_info *ssif_info = i2c_get_clientdata(client);
- struct ipmi_smi *intf;
struct ssif_addr_info *addr_info;

if (!ssif_info)
@@ -1235,9 +1228,7 @@ static int ssif_remove(struct i2c_client
* After this point, we won't deliver anything asychronously
* to the message handler. We can unregister ourself.
*/
- intf = ssif_info->intf;
- ssif_info->intf = NULL;
- ipmi_unregister_smi(intf);
+ ipmi_unregister_smi(ssif_info->intf);

list_for_each_entry(addr_info, &ssif_infos, link) {
if (addr_info->client == client) {
@@ -1246,6 +1237,8 @@ static int ssif_remove(struct i2c_client
}
}

+ kfree(ssif_info);
+
return 0;
}


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