Linux Kernel NULL Pointer Dereference Vulnerability in DMA Engine DW-AXI-DMAC

A vulnerability in the Linux kernel's DMA engine component, specifically the DW-AXI-DMAC, has been addressed. The issue arose during debugging when a NULL Linked List Item (LLI) pointer was passed to the 'axi_chan_dump_lli()' function. This resulted in a system crash (OOPS) as the function attempted to access fields from the NULL pointer. The vulnerability has been resolved by modifying the error handling to simply print a message about the NULL LLI and exit, thereby preventing the crash.

Impact

The vulnerability could lead to a NULL pointer dereference, causing a system crash.