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A common user error is to call glDrawRangeElements() with the 'end' argument being one too large. If we use the vbuf module to translate some vertex attributes this error can cause us to read past the end of the mapped hardware buffer, resulting in a crash. This patch adjusts the vertex count to avoid that issue. Typically, the vertex_count gets decremented by one. This fixes crashes with the Unigine Tropics and Sanctuary demos with older VMware hardware versions. The issue isn't hit with VGPU10 because we don't hit this fallback. No piglit changes. CC: mesa-stable@lists.freedesktop.org Reviewed-by: Marek Olšák <marek.olsak@amd.com> (cherry picked from commit d8148ed1 ) [Andres Gomez: pipe_vertex_buffer hadn't shrunk yet] Signed-off-by: Andres Gomez <agomez@igalia.com> Conflicts: src/gallium/auxiliary/util/u_vbuf.c
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