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All of the oversampling and undersampling functions in SDL_audiotypecvt.c contain the line:

while (dst != target) {

Some or all of these functions are prone to array overflows because sometimes dst will be increased or decreased by an amount that skips over target.  Changing != to < or > depending on whether dst is being increased or decreased corrects the problem.

One way to aggravate this problem is to call Mix_OpenAudio with a frequency of 44.1kHz and then try to load a 48000kHz sound.

This solution might leave some bytes at the end of arrays that have not been written to.  If this is a problem, perhaps more careful sizing of the arrays is necessary.