util/primconvert: Avoid OoB with improbable draws (!31914) · Merge requests · Mesa / mesa · GitLab

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Rob Clark requested to merge robclark/mesa:gallium/primconvert-asan into main Oct 30, 2024

What does this MR do and why?

util/primconvert: Avoid OoB with improbable draws

Detect when the temporary index buffer cannot be generated due to too
large primitive count, and simply drop the draw on the floor.

Fixes a webgl reachable asan/crash.

Cc: mesa-stable
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/12092
Signed-off-by: Rob Clark <robdclark@chromium.org>