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panfrost: Remove vertex buffer offset from its size

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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>
This commit is contained in:
Alyssa Rosenzweig 2019-08-22 08:02:52 -07:00
parent f4678f3c62
commit eeebf5c2df
1 changed files with 5 additions and 2 deletions
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7
src/gallium/drivers/panfrost/pan_instancing.c
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@ -292,7 +292,7 @@ panfrost_emit_vertex_data(struct panfrost_job *batch)
* will be adjusted back when we fixup the src_offset in
* mali_attr_meta */
mali_ptr raw_addr = panfrost_vertex_buffer_address(ctx, vbi);
mali_ptr raw_addr = rsrc->bo->gpu + buf->buffer_offset;
mali_ptr addr = raw_addr & ~63;
unsigned chopped_addr = raw_addr - addr;
@ -302,7 +302,10 @@ panfrost_emit_vertex_data(struct panfrost_job *batch)
/* Set common fields */
attrs[k].elements = addr;
attrs[k].stride = buf->stride;
attrs[k].size = rsrc->base.width0;
/* Since we advanced the base pointer, we shrink the buffer
* size */
attrs[k].size = rsrc->base.width0 - buf->buffer_offset;
/* We need to add the extra size we masked off (for
* correctness) so the data doesn't get clamped away */