Add a simple check to reject any size not aligned to the min_page_size. handle instances when size is not aligned with the min_page_size. Unigine Heaven has allocation requests for example required pages are 257 and alignment request is 256. To allocate the left over 1 page, continues the iteration to find the order value which is 0 and when it compares with min_order = 8, triggers the BUG_ON(order < min_order). To avoid this problem, we added a simple check to return -EINVAL if size is not aligned to the min_page_size. v2: Added more details to the commit description Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@xxxxxxx> Suggested-by: Matthew Auld <matthew.auld@xxxxxxxxx> --- drivers/gpu/drm/drm_buddy.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c index 72f52f293249..b503c88786b0 100644 --- a/drivers/gpu/drm/drm_buddy.c +++ b/drivers/gpu/drm/drm_buddy.c @@ -661,6 +661,9 @@ int drm_buddy_alloc_blocks(struct drm_buddy *mm, if (range_overflows(start, size, mm->size)) return -EINVAL; + if (WARN_ON(!IS_ALIGNED(size, min_page_size))) + return -EINVAL; + /* Actual range allocation */ if (start + size == end) return __drm_buddy_alloc_range(mm, start, size, blocks); base-commit: 056d47eaf6ea753fa2e21da31f9cbd8b721bbb7b -- 2.25.1
