The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x 1422b526fba994cf05fd288a152106563b875fce # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023090202-caddie-slang-9a89@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 1422b526fba994cf05fd288a152106563b875fce Mon Sep 17 00:00:00 2001 From: Nam Cao namcaov@gmail.com Date: Mon, 31 Jul 2023 13:06:20 +0200 Subject: [PATCH] staging: rtl8712: fix race condition

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.co... Fixes: 8c213fa59199 ("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

diff --git a/drivers/staging/rtl8712/os_intfs.c b/drivers/staging/rtl8712/os_intfs.c index a2f3645be0cc..b18e6d9c832b 100644 --- a/drivers/staging/rtl8712/os_intfs.c +++ b/drivers/staging/rtl8712/os_intfs.c @@ -327,6 +327,7 @@ int r8712_init_drv_sw(struct _adapter *padapter) mp871xinit(padapter); init_default_value(padapter); r8712_InitSwLeds(padapter); + mutex_init(&padapter->mutex_start);

return 0;

diff --git a/drivers/staging/rtl8712/usb_intf.c b/drivers/staging/rtl8712/usb_intf.c index 37364d3101e2..df05213f922f 100644 --- a/drivers/staging/rtl8712/usb_intf.c +++ b/drivers/staging/rtl8712/usb_intf.c @@ -567,7 +567,6 @@ static int r871xu_drv_init(struct usb_interface *pusb_intf, if (rtl871x_load_fw(padapter)) goto deinit_drv_sw; init_completion(&padapter->rx_filter_ready); - mutex_init(&padapter->mutex_start); return 0;

deinit_drv_sw: