diff --git a/drivers/accel/ethosu/ethosu_gem.c b/drivers/accel/ethosu/ethosu_gem.c
index ff5e58944138..7994e7073903 100644
--- a/drivers/accel/ethosu/ethosu_gem.c
+++ b/drivers/accel/ethosu/ethosu_gem.c
@@ -245,11 +245,14 @@ static int calc_sizes(struct drm_device *ddev,
 			((st->ifm.stride_kernel >> 1) & 0x1) + 1;
 		u32 stride_x = ((st->ifm.stride_kernel >> 5) & 0x2) +
 			(st->ifm.stride_kernel & 0x1) + 1;
-		u32 ifm_height = st->ofm.height[2] * stride_y +
+		s32 ifm_height = st->ofm.height[2] * stride_y +
 			st->ifm.height[2] - (st->ifm.pad_top + st->ifm.pad_bottom);
-		u32 ifm_width  = st->ofm.width * stride_x +
+		s32 ifm_width = st->ofm.width * stride_x +
 			st->ifm.width - (st->ifm.pad_left + st->ifm.pad_right);
 
+		if (ifm_height < 0 || ifm_width < 0)
+			return -EINVAL;
+
 		len = feat_matrix_length(info, &st->ifm, ifm_width,
 					 ifm_height, st->ifm.depth);
 		dev_dbg(ddev->dev, "op %d: IFM:%d:0x%llx-0x%llx\n",