linux-kernel - [PATCH] drm/panthor: check bo offset alignment in vm bind

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Message-ID: <20250828200116.3532255-1-olvaffe@gmail.com>
Date: Thu, 28 Aug 2025 13:01:16 -0700
From: Chia-I Wu <olvaffe@...il.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/panthor: check bo offset alignment in vm bind

Fail early from panthor_vm_bind_prepare_op_ctx instead of late from
ops->map_pages.

Signed-off-by: Chia-I Wu <olvaffe@...il.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
---
 drivers/gpu/drm/panthor/panthor_mmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c
index bad720f23eb70..6dec4354e3789 100644
--- a/drivers/gpu/drm/panthor/panthor_mmu.c
+++ b/drivers/gpu/drm/panthor/panthor_mmu.c
@@ -1222,7 +1222,7 @@ static int panthor_vm_prepare_map_op_ctx(struct panthor_vm_op_ctx *op_ctx,
 	    (flags & DRM_PANTHOR_VM_BIND_OP_TYPE_MASK) != DRM_PANTHOR_VM_BIND_OP_TYPE_MAP)
 		return -EINVAL;
 
-	/* Make sure the VA and size are aligned and in-bounds. */
+	/* Make sure the VA and size are in-bounds. */
 	if (size > bo->base.base.size || offset > bo->base.base.size - size)
 		return -EINVAL;
 
@@ -2447,7 +2447,7 @@ panthor_vm_bind_prepare_op_ctx(struct drm_file *file,
 	int ret;
 
 	/* Aligned on page size. */
-	if (!IS_ALIGNED(op->va | op->size, vm_pgsz))
+	if (!IS_ALIGNED(op->va | op->size | op->bo_offset, vm_pgsz))
 		return -EINVAL;
 
 	switch (op->flags & DRM_PANTHOR_VM_BIND_OP_TYPE_MASK) {
-- 
2.51.0.318.gd7df087d1a-goog