kernel: wifi: rtl8xxxu: add cancel_work_sync() for c2hcmd_work

A vulnerability was found in the Linux kernel's net rtl8xxxucore.c driver, where a race condition can lead to a use-after-free situation in the rtl8xxxustop function. This occurs when the workqueue is still running but the driver has been stopped and can lead to c2hcmdwork attempting to access...

UBUNTU-CVE-2019-19068

A memory leak in the rtl8xxxusubmitinturb function in drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxucore.c in the Linux kernel through 5.3.11 allows attackers to cause a denial of service memory consumption by triggering usbsubmiturb failures, aka CID-a2cdd07488e6...