[stb_image] image too large check is wrong

[MWP]

stb_image being used on a STM32 ARM Cortex-M7 micro controller.
Firmware built using gcc.

stb/stb_image.h

Line 5121 in 013ac3b

if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");

stb_image.h line 5121 checking size of a PNG image returns with the error "Image too large to decode", when it should not.
In my test case, the PNG is 8bpp, RGBA, 300 x 100 pixels.
I have step-debugged the code, img_x, img_y, img_n are correct (300, 100, 4 respectively).

[NBickford-NV]

Hi! I'm trying to think about how this can happen -- are ints 16 bits on this platform, maybe? (1 << 30) / s->img_x / s->img_n here should evaluate to (1 << 30) / 300 / 4 == 894784, but if (1 << 30)'s truncated to 16 bits, then it would evaluate to 0. (The idea behind this check is that it tests whether x * y * n > 2^30 without risking integer overflow.)

Thanks!