panfrost: Remove vertex buffer offset from its size
The offset is added to the base address, so we need to subtract it from the size to maintain the same end address and thus prevent a buffer overflow: end_address = start_address + size start_address' = start_address + offset size' = size - offset end_address' = start_address' + size' = (start_address + offset) + (size - offset) = (start_address + size) + (offset - offset) = start_address + size = end_address QED. Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
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@ -292,7 +292,7 @@ panfrost_emit_vertex_data(struct panfrost_job *batch)
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* will be adjusted back when we fixup the src_offset in
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* mali_attr_meta */
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mali_ptr raw_addr = panfrost_vertex_buffer_address(ctx, vbi);
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mali_ptr raw_addr = rsrc->bo->gpu + buf->buffer_offset;
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mali_ptr addr = raw_addr & ~63;
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unsigned chopped_addr = raw_addr - addr;
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@ -302,7 +302,10 @@ panfrost_emit_vertex_data(struct panfrost_job *batch)
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/* Set common fields */
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attrs[k].elements = addr;
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attrs[k].stride = buf->stride;
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attrs[k].size = rsrc->base.width0;
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/* Since we advanced the base pointer, we shrink the buffer
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* size */
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attrs[k].size = rsrc->base.width0 - buf->buffer_offset;
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/* We need to add the extra size we masked off (for
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* correctness) so the data doesn't get clamped away */
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