This is a note to let you know that I've just added the patch titled USB: cdc-acm: fix double free on probe failure to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-cdc-acm-fix-double-free-on-probe-failure.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 7180495cb3d0e2a2860d282a468b4146c21da78f Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan@xxxxxxxxxx> Date: Mon, 22 Mar 2021 16:53:11 +0100 Subject: USB: cdc-acm: fix double free on probe failure From: Johan Hovold <johan@xxxxxxxxxx> commit 7180495cb3d0e2a2860d282a468b4146c21da78f upstream. If tty-device registration fails the driver copy of any Country Selection functional descriptor would end up being freed twice; first explicitly in the error path and then again in the tty-port destructor. Drop the first erroneous free that was left when fixing a tty-port resource leak. Fixes: cae2bc768d17 ("usb: cdc-acm: Decrement tty port's refcount if probe() fail") Cc: stable@xxxxxxxxxxxxxxx # 4.19 Cc: Jaejoong Kim <climbbb.kim@xxxxxxxxx> Acked-by: Oliver Neukum <oneukum@xxxxxxxx> Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> Link: https://lore.kernel.org/r/20210322155318.9837-2-johan@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/class/cdc-acm.c | 1 - 1 file changed, 1 deletion(-) --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1521,7 +1521,6 @@ alloc_fail6: &dev_attr_wCountryCodes); device_remove_file(&acm->control->dev, &dev_attr_iCountryCodeRelDate); - kfree(acm->country_codes); } device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities); alloc_fail5: Patches currently in stable-queue which might be from johan@xxxxxxxxxx are queue-5.11/usb-cdc-acm-fix-use-after-free-after-probe-failure.patch queue-5.11/usb-cdc-acm-fix-double-free-on-probe-failure.patch