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staging: rtl8712: handle firmware load failure 

when firmware fails to load we should not call unregister_netdev()
this patch fixes a race condition between rtl871x_load_fw_cb() and
r871xu_dev_remove() and fixes the bug reported by syzbot

Reported-by: syzbot+80899a8a8efe8968cde7@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=80899a8a8efe8968cde7
Signed-off-by: Rustam Kovhaev <rkovhaev@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200716151324.1036204-1-rkovhaev@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rustam Kovhaev 2020-07-16 08:13:26 -07:00 committed by Greg Kroah-Hartman
parent c4283950a9
commit b4383c971b
2 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/staging/rtl8712/hal_init.c
View File

@ -33,7 +33,6 @@ static void rtl871x_load_fw_cb(const struct firmware *firmware, void *context)
{
struct _adapter *adapter = context;
complete(&adapter->rtl8712_fw_ready);
if (!firmware) {
struct usb_device *udev = adapter->dvobjpriv.pusbdev;
struct usb_interface *usb_intf = adapter->pusb_intf;
@ -41,11 +40,13 @@ static void rtl871x_load_fw_cb(const struct firmware *firmware, void *context)
dev_err(&udev->dev, "r8712u: Firmware request failed\n");
usb_put_dev(udev);
usb_set_intfdata(usb_intf, NULL);
complete(&adapter->rtl8712_fw_ready);
return;
}
adapter->fw = firmware;
/* firmware available - start netdev */
register_netdev(adapter->pnetdev);
complete(&adapter->rtl8712_fw_ready);
}
static const char firmware_file[] = "rtlwifi/rtl8712u.bin";

11
drivers/staging/rtl8712/usb_intf.c
View File

@ -595,13 +595,17 @@ static void r871xu_dev_remove(struct usb_interface *pusb_intf)
if (pnetdev) {
struct _adapter *padapter = netdev_priv(pnetdev);
usb_set_intfdata(pusb_intf, NULL);
release_firmware(padapter->fw);
/* never exit with a firmware callback pending */
wait_for_completion(&padapter->rtl8712_fw_ready);
pnetdev = usb_get_intfdata(pusb_intf);
usb_set_intfdata(pusb_intf, NULL);
if (!pnetdev)
goto firmware_load_fail;
release_firmware(padapter->fw);
if (drvpriv.drv_registered)
padapter->surprise_removed = true;
unregister_netdev(pnetdev); /* will call netdev_close() */
if (pnetdev->reg_state != NETREG_UNINITIALIZED)
unregister_netdev(pnetdev); /* will call netdev_close() */
flush_scheduled_work();
udelay(1);
/* Stop driver mlme relation timer */
@ -614,6 +618,7 @@ static void r871xu_dev_remove(struct usb_interface *pusb_intf)
*/
usb_put_dev(udev);
}
firmware_load_fail:
/* If we didn't unplug usb dongle and remove/insert module, driver
* fails on sitesurvey for the first time when device is up.
* Reset usb port for sitesurvey fail issue.