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Fix some IPMI crashes

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Some crash fixes have come in dealing with various error handling
 issues.  They have sat in next for 5 days or more without issue, and
 they are fairly critical.
 
 -corey
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Merge tag 'for-linus-5.16-3' of git://github.com/cminyard/linux-ipmi

Pull IPMI fixes from Corey Minyard:
 "Fix some IPMI crashes

  Some crash fixes have come in dealing with various error handling
  issues. They have sat in next for 5 days or more without issue, and
  they are fairly critical"

* tag 'for-linus-5.16-3' of git://github.com/cminyard/linux-ipmi:
  ipmi: Fix UAF when uninstall ipmi_si and ipmi_msghandler module
  ipmi: fix initialization when workqueue allocation fails
  ipmi: bail out if init_srcu_struct fails
  ipmi: ssif: initialize ssif_info->client early
This commit is contained in:
Linus Torvalds 2021-12-22 10:11:17 -08:00
commit 0740040580
2 changed files with 18 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/char/ipmi/ipmi_msghandler.c
View File

@ -3031,7 +3031,7 @@ cleanup_bmc_device(struct kref *ref)
* with removing the device attributes while reading a device
* attribute.
*/
schedule_work(&bmc->remove_work);
queue_work(remove_work_wq, &bmc->remove_work);
}
/*
@ -5392,22 +5392,27 @@ static int ipmi_init_msghandler(void)
if (initialized)
goto out;
init_srcu_struct(&ipmi_interfaces_srcu);
rv = init_srcu_struct(&ipmi_interfaces_srcu);
if (rv)
goto out;
remove_work_wq = create_singlethread_workqueue("ipmi-msghandler-remove-wq");
if (!remove_work_wq) {
pr_err("unable to create ipmi-msghandler-remove-wq workqueue");
rv = -ENOMEM;
goto out_wq;
}
timer_setup(&ipmi_timer, ipmi_timeout, 0);
mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
remove_work_wq = create_singlethread_workqueue("ipmi-msghandler-remove-wq");
if (!remove_work_wq) {
pr_err("unable to create ipmi-msghandler-remove-wq workqueue");
rv = -ENOMEM;
goto out;
}
initialized = true;
out_wq:
if (rv)
cleanup_srcu_struct(&ipmi_interfaces_srcu);
out:
mutex_unlock(&ipmi_interfaces_mutex);
return rv;

7
drivers/char/ipmi/ipmi_ssif.c
View File

@ -1659,6 +1659,9 @@ static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
}
}
ssif_info->client = client;
i2c_set_clientdata(client, ssif_info);
rv = ssif_check_and_remove(client, ssif_info);
/* If rv is 0 and addr source is not SI_ACPI, continue probing */
if (!rv && ssif_info->addr_source == SI_ACPI) {
@ -1679,9 +1682,6 @@ static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
ipmi_addr_src_to_str(ssif_info->addr_source),
client->addr, client->adapter->name, slave_addr);
ssif_info->client = client;
i2c_set_clientdata(client, ssif_info);
/* Now check for system interface capabilities */
msg[0] = IPMI_NETFN_APP_REQUEST << 2;
msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;
@ -1881,6 +1881,7 @@ static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
dev_err(&ssif_info->client->dev,
"Unable to start IPMI SSIF: %d\n", rv);
i2c_set_clientdata(client, NULL);
kfree(ssif_info);
}
kfree(resp);