ImageMagick: MSL - Stack overflow in ProcessMSLScript

Summary

Magick fails to check for circular references between two MSLs, leading to a stack overflow.

Details

After reading a.msl using magick, the following is displayed:

MSLStartElement -> ReadImage -> ReadMSLImage -> ProcessMSLScript -> xmlParseChunk -> xmlParseTryOrFinish -> MSLStartElement

AddressSanitizer:DEADLYSIGNAL
=================================================================
==114345==ERROR: AddressSanitizer: UNKNOWN SIGNAL on unknown address 0x000000000000 (pc 0x72509fc7d804 bp 0x7ffd6598b390 sp 0x7ffd6598ab20 T0)
    #0 0x72509fc7d804 in strlen ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:388
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