[PATCH 6/7] drm/nouveau: more paranoia in nouveau_bo_fixup_align

[maarten.lankhorst at canonical.com]

From: Maarten Lankhorst <maarten.lankhorst at canonical.com>

Make sure that buffers are always aligned.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>
---
 drivers/gpu/drm/nouveau/nouveau_bo.c | 40 +++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index bb3734d..635a192 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -160,24 +160,20 @@ nouveau_bo_fixup_align(struct nouveau_bo *nvbo, u32 flags,
 	struct nouveau_drm *drm = nouveau_bdev(nvbo->bo.bdev);
 	struct nouveau_device *device = nv_device(drm->device);
 
-	if (device->card_type < NV_50) {
-		if (nvbo->tile_mode) {
-			if (device->chipset >= 0x40) {
-				*align = 65536;
-				*size = roundup(*size, 64 * nvbo->tile_mode);
-
-			} else if (device->chipset >= 0x30) {
-				*align = 32768;
-				*size = roundup(*size, 64 * nvbo->tile_mode);
-
-			} else if (device->chipset >= 0x20) {
-				*align = 16384;
-				*size = roundup(*size, 64 * nvbo->tile_mode);
-
-			} else if (device->chipset >= 0x10) {
-				*align = 16384;
-				*size = roundup(*size, 32 * nvbo->tile_mode);
-			}
+	if (device->chipset >= 0x10 && device->card_type < NV_50 &&
+	    nvbo->tile_mode) {
+		if (device->chipset >= 0x40) {
+			*align = 65536;
+			*size = roundup(*size, 64 * nvbo->tile_mode);
+		} else if (device->chipset >= 0x30) {
+			*align = 32768;
+			*size = roundup(*size, 64 * nvbo->tile_mode);
+		} else if (device->chipset >= 0x20) {
+			*align = 16384;
+			*size = roundup(*size, 64 * nvbo->tile_mode);
+		} else {
+			*align = 16384;
+			*size = roundup(*size, 32 * nvbo->tile_mode);
 		}
 	} else {
 		*size = roundup(*size, (1 << nvbo->page_shift));
@@ -228,8 +224,14 @@ nouveau_bo_new(struct drm_device *dev, int size, int align,
 		if (!(flags & TTM_PL_FLAG_TT) && size > 256 * 1024)
 			nvbo->page_shift = drm->client.base.vm->vmm->lpg_shift;
 	}
-
 	nouveau_bo_fixup_align(nvbo, flags, &align, &size);
+	if (size <= 0) {
+		nv_warn(drm, "invalid size %x after setting alignment %x\n",
+			size, align);
+		kfree(nvbo);
+		return -EINVAL;
+	}
+
 	nvbo->bo.mem.num_pages = size >> PAGE_SHIFT;
 	nouveau_bo_placement_set(nvbo, flags, 0);
 
-- 
1.8.4