Backport PR #20629 on branch v3.4.x (Add protection against out-of-bounds read in ttconv) - #20642

Backport PR #20629 on branch v3.4.x (Add protection against out-of-bounds read in ttconv)#20642

QuLogic merged 1 commit into

matplotlib:v3.4.xmatplotlib/matplotlib:v3.4.xfrom

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