Commit c052cc1a authored Oct 20, 2021 by Pavel Skripkin Committed by Greg Kroah-Hartman Oct 20, 2021

staging: rtl8712: fix use-after-free in rtl8712_dl_fw



Syzbot reported use-after-free in rtl8712_dl_fw(). The problem was in
race condition between r871xu_dev_remove() ->ndo_open() callback.

It's easy to see from crash log, that driver accesses released firmware
in ->ndo_open() callback. It may happen, since driver was releasing
firmware _before_ unregistering netdev. Fix it by moving
unregister_netdev() before cleaning up resources.

Call Trace:
...
 rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline]
 rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170
 rtl8712_hal_init drivers/staging/rtl8712/hal_init.c:330 [inline]
 rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394
 netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380
 __dev_open+0x2bc/0x4d0 net/core/dev.c:1484

Freed by task 1306:
...
 release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053
 r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599
 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458

Fixes: 8c213fa5 ("staging: r8712u: Use asynchronous firmware loading")
Cc: stable <stable@vger.kernel.org>
Reported-and-tested-by:  <syzbot+c55162be492189fb4f51@syzkaller.appspotmail.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: https://lore.kernel.org/r/20211019211718.26354-1-paskripkin@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 5978d492

drivers/staging/rtl8712/usb_intf.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -595,12 +595,12 @@ static void r871xu_dev_remove(struct usb_interface *pusb_intf)

		/* never exit with a firmware callback pending */
		wait_for_completion(&padapter->rtl8712_fw_ready);
		if (pnetdev->reg_state != NETREG_UNINITIALIZED)
		unregister_netdev(pnetdev); /* will call netdev_close() */
		usb_set_intfdata(pusb_intf, NULL);
		release_firmware(padapter->fw);
		if (drvpriv.drv_registered)
		padapter->surprise_removed = true;
		if (pnetdev->reg_state != NETREG_UNINITIALIZED)
		unregister_netdev(pnetdev); /* will call netdev_close() */
		r8712_flush_rwctrl_works(padapter);
		r8712_flush_led_works(padapter);
		udelay(1);