heap use-after-free false positive? [closed]

Closed yesterday.

Runtime error: Addition of unsigned offset to overflowed to – 4

Kindly go through the entire question before labelling this as a duplicate.

Is this a false positive in address sanitizer?

I’m using the shaderc library to compile glsl to SPIRV, and when I call shaderc_compile_into_spv() I get (I’m including an image for better depiction):