Linux Kernel Vidtv Driver Null Pointer Dereference Vulnerability

A null pointer dereference vulnerability has been identified in the Linux kernel's Vidtv driver. This issue arises in the 'vidtv_mux_stop_thread' function when the 'dvb->mux' variable is not properly initialized by 'vidtv_mux_init' during the 'vidtv_start_streaming' process. The flaw can be triggered by stopping a streaming feed that has not been correctly set up, leading to a crash.

Impact

Exploitation of this vulnerability causes a null pointer dereference, which typically results in a system crash or denial of service.

Reproduction

The vulnerability can be reproduced by initializing a DVB feed with the Vidtv driver and then stopping the feed before the mux has been properly set up. This sequence will trigger the null pointer dereference in the 'vidtv_mux_stop_thread' function.