CVE-2023-31083: Concurrent Execution using Shared Resource with Improper Synchronization

An issue was discovered in drivers/bluetooth/hcildisc.c in the Linux kernel 6.2. In hciuartttyioctl, there is a race condition between HCIUARTSETPROTO and HCIUARTGETPROTO. HCIUARTPROTOSET is set before hu-proto is set. A NULL pointer dereference may occur...