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staging: rtl8712: fix race condition

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commit 1422b526fb upstream.

In probe function, request_firmware_nowait() is called to load firmware
asynchronously. At completion of firmware loading, register_netdev() is
called. However, a mutex needed by netdev is initialized after the call
to request_firmware_nowait(). Consequently, it can happen that
register_netdev() is called before the driver is ready.

Move the mutex initialization into r8712_init_drv_sw(), which is called
before request_firmware_nowait().

Reported-by: syzbot+b08315e8cf5a78eed03c@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/linux-staging/000000000000d9d4560601b8e0d7@google.com/T/#u
Fixes: 8c213fa591 ("staging: r8712u: Use asynchronous firmware loading")
Cc: stable <stable@kernel.org>
Signed-off-by: Nam Cao <namcaov@gmail.com>
Link: https://lore.kernel.org/r/20230731110620.116562-1-namcaov@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nam Cao 2023-07-31 13:06:20 +02:00 • committed by Justin Hammond
parent 549f438c37
commit 1bf7058f99
2 changed files with 1 additions and 1 deletions
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1
drivers/staging/rtl8712/os_intfs.c
View file

@ -323,6 +323,7 @@ int r8712_init_drv_sw(struct _adapter *padapter)
mp871xinit(padapter);
init_default_value(padapter);
r8712_InitSwLeds(padapter);
mutex_init(&padapter->mutex_start);
return ret;
}

1
drivers/staging/rtl8712/usb_intf.c
View file

@ -567,7 +567,6 @@ static int r871xu_drv_init(struct usb_interface *pusb_intf,
if (rtl871x_load_fw(padapter))
goto deinit_drv_sw;
spin_lock_init(&padapter->lock_rx_ff0_filter);
mutex_init(&padapter->mutex_start);
return 0;
deinit_drv_sw: