CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's AMD GPU driver, specifically in the handling of virtual memory migration where an uninitialized variable can lead to improper memory management. This flaw may result in the loss of all VRAM allocated, potentially causing system instability or crashes. Organizations utilizing Linux systems with AMD GPUs should prioritize this patch to mitigate risks associated with memory corruption and system reliability.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram When migration vm range is hole at cpu side(MIGRATE_PFN_MIGRATE set + MIGRATE_PFN_VALID unset) driver still allocates device pages. There is no dma map of src pages and migration. j is 0 and svm_migrate_copy_memory_gart() will return an uninitialized r. That can trigger out_free_vram_pages to drop all VRAM just set up. Initialize r and only call the last svm_migrate_copy_memory_gart if j > 0. Current code postponed the last page to the final copy. This patch flushes on the last page when reach to the end of current drm_buddy_block; avoids another svm_migrate_copy_memory_gart.