596d2ab0ad
the original change here attempted to fix calculating the maximum bound for the
mapped readback buffer by adding the maximum attribute size to the final element
used by readback
the calculation was erroneous, however, because it instead calculated the maximum
offset instead of the size, which would cause a different kind of overrun
Fixes: 3c5b7dca30 ("util/vbuf: fix buffer overrun in attribute conversions")
fixes #5846
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14479>
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