firmware loader: fix pending_fw_head list corruption

Got the following oops just before reboot:

Unable to handle kernel NULL pointer dereference at virtual address 00000000
[<8028d300>] (__list_del_entry+0x44/0xac)
[<802e3320>] (__fw_load_abort.part.13+0x1c/0x50)
[<802e337c>] (fw_shutdown_notify+0x28/0x50)
[<80034f80>] (notifier_call_chain.isra.1+0x5c/0x9c)
[<800350ec>] (__blocking_notifier_call_chain+0x44/0x58)
[<80035114>] (blocking_notifier_call_chain+0x14/0x18)
[<80035d64>] (kernel_restart_prepare+0x14/0x38)
[<80035d94>] (kernel_restart+0xc/0x50)

The following race condition triggers here:

  _request_firmware_load()
  device_create_file(...)
  kobject_uevent(...)
  (schedule)
                                       (resume)
                                       firmware_loading_store(1)
                                       firmware_loading_store(0)
                                       list_del_init(&buf->pending_list)
                                       (schedule)
  (resume)
  list_add(&buf->pending_list, &pending_fw_head);
  wait_for_completion(&buf->completion);

causing an oops later when walking pending_list after the firmware has
been released.

The proposed fix is to move the list_add() before sysfs attribute
creation.

Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Acked-by: Ming Lei <ming.lei@canonical.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 55d682e6ecea92b183997f2ecfa2858df7d567ba..d7872b96019d22db197554bfa9ae2102a96f1ba4 100644 (file)
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -884,8 +884,15 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
                goto err_del_dev;
        }
 
+       mutex_lock(&fw_lock);
+       list_add(&buf->pending_list, &pending_fw_head);
+       mutex_unlock(&fw_lock);
+
        retval = device_create_file(f_dev, &dev_attr_loading);
        if (retval) {
+               mutex_lock(&fw_lock);
+               list_del_init(&buf->pending_list);
+               mutex_unlock(&fw_lock);
                dev_err(f_dev, "%s: device_create_file failed\n", __func__);
                goto err_del_bin_attr;
        }
@@ -899,10 +906,6 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
                kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD);
        }
 
-       mutex_lock(&fw_lock);
-       list_add(&buf->pending_list, &pending_fw_head);
-       mutex_unlock(&fw_lock);
-
        wait_for_completion(&buf->completion);
 
        cancel_delayed_work_sync(&fw_priv->timeout_work);