If vertex->idx == dma->buf_count then we end up reading one element
beyond the end of the dma->buflist[] array.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/i810/i810_dma.c b/drivers/gpu/drm/i810/i810_dma.c
index 576a417690d4..3b378936f575 100644
--- a/drivers/gpu/drm/i810/i810_dma.c
+++ b/drivers/gpu/drm/i810/i810_dma.c
@@ -934,7 +934,7 @@ static int i810_dma_vertex(struct drm_device *dev, void *data,
DRM_DEBUG("idx %d used %d discard %d\n",
vertex->idx, vertex->used, vertex->discard);
- if (vertex->idx < 0 || vertex->idx > dma->buf_count)
+ if (vertex->idx < 0 || vertex->idx >= dma->buf_count)
return -EINVAL;
i810_dma_dispatch_vertex(dev,
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