drm_mm_init() rejects a zero-length allocation range with a BUG check. Several DRM TTM users can derive a zero page count from device-provided VRAM metadata and pass it to the range manager.
This series rejects empty ranges at the affected callers and adds a defensive check in the common range manager. Patches 1 through 4 and 6 validate the individual driver inputs. Patch 5 protects the shared range-manager API against any remaining zero-page caller. The series was checked with scripts/checkpatch.pl for every code patch. Jiale Yao (6): drm/vram-helper: reject empty VRAM ranges drm/nouveau: reject empty VRAM ranges drm/qxl: reject empty TTM memory ranges drm/radeon: reject empty VRAM ranges drm/ttm: reject empty range manager sizes drm/vmwgfx: reject empty VRAM ranges drivers/gpu/drm/drm_gem_vram_helper.c | 3 +++ drivers/gpu/drm/nouveau/nouveau_ttm.c | 3 +++ drivers/gpu/drm/qxl/qxl_ttm.c | 3 +++ drivers/gpu/drm/radeon/radeon_ttm.c | 3 +++ drivers/gpu/drm/ttm/ttm_range_manager.c | 3 +++ drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 4 ++++ 6 files changed, 19 insertions(+) -- 2.34.1
