Linux Kernel DMA Engine DW-AXI-DMAC Interrupt Handling Vulnerability Leading to Kernel Oops

A vulnerability in the Linux kernel's DMA engine component, specifically the DW-AXI-DMAC driver, can cause a kernel OOPS error. This issue occurs when an interrupt is raised while the channel has no descriptor, leading to a null pointer dereference. The vulnerability has been addressed by modifying the interrupt handler to check for the presence of a descriptor before processing the interrupt.

Impact

Exploitation of this vulnerability can lead to a kernel OOPS, causing a null pointer dereference and potentially disrupting system stability.