OSV-2020-1591 UNKNOWN READ in ft_smooth_overlap_spans

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24729 Crash type: UNKNOWN READ Crash state: ftsmoothoverlapspans graysweep grayconvertglyph...

imagemagick:ping_ttf_fuzzer: Heap-buffer-overflow in ft_smooth_overlap_spans

Detailed Report: https://oss-fuzz.com/testcase?key=5471030328688640 Project: imagemagick Fuzzing Engine: libFuzzer Fuzz Target: pingttffuzzer Job Type: libfuzzerasanimagemagick Platform Id: linux Crash Type: Heap-buffer-overflow READ 1 Crash Address: 0x7fa32c632194 Crash State: ftsmoothoverlapspa...