CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's dmaengine, specifically in the AXIDMA and MCDMA interrupt handlers, where a race condition can lead to incorrect channel state management. This flaw may result in spurious transfer attempts and potential descriptor corruption when multiple descriptors are active, which could disrupt data processing. Organizations using Linux systems that rely on these DMA engines should prioritize addressing this issue to ensure data integrity and system stability.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: xilinx_dma: Fix channel idle state management in AXIDMA and MCDMA interrupt handlers Fix a race condition in AXIDMA and MCDMA irq handlers where the channel could be incorrectly marked as idle and attempt spurious transfers when descriptors are still being processed. The issue occurs when: 1. Multiple descriptors are queued and active. 2. An interrupt fires after completing some descriptors. 3. xilinx_dma_complete_descriptor() moves completed descriptors to done_list. 4. Channel is marked idle and start_transfer() is called even though active_list still contains unprocessed descriptors. 5. This leads to premature transfer attempts and potential descriptor corruption or missed completions. Only mark the channel as idle and start new transfers when the active list is actually empty, ensuring proper channel state management and avoiding spurious transfer attempts.