APPLIED[Bionic]: [SRU] [B/C] [PATCH 0/1] Fix null pointer dereference when xHCI gets unplugged

[Kleber Souza]

On 05/14/18 10:21, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1768852
> 
> [Impact]
> When unplugging the Thunderbolt 3 cable from the TBT controller, kernel
> oops.
> 
> [Test]
> The user confirms this patch works.
> 
> [Fix]
> tty_unregister_driver may be called more than 1 time in some
> hotplug cases,it will cause the kernel oops. This patch checked
> dbc_tty_driver to make sure it is unregistered only 1 time.
> 
> [Regression Potential]
> Low. The change is to guard against null pointer, so it's the correct
> behavior.
> 
> Zhengjun Xing (1):
>   xhci: Fix Kernel oops in xhci dbgtty
> 
>  drivers/usb/host/xhci-dbgtty.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 

Applied to bionic/master-next branch.

Thanks,
Kleber