void ass_pre_blur3_horz_c(int16_t *dst, const int16_t *src,
                          uintptr_t src_width, uintptr_t src_height)
{
    uintptr_t dst_width = src_width + 6;
    uintptr_t size = ((src_width + STRIPE_MASK) & ~STRIPE_MASK) * src_height;
    uintptr_t step = STRIPE_WIDTH * src_height;

    uintptr_t offs = 0;
    int16_t buf[2 * STRIPE_WIDTH];
    int16_t *ptr = buf + STRIPE_WIDTH;
    for (uintptr_t x = 0; x < dst_width; x += STRIPE_WIDTH) {
        for (uintptr_t y = 0; y < src_height; ++y) {
            copy_line(ptr - 1 * STRIPE_WIDTH, src, offs - 1 * step, size);
            copy_line(ptr - 0 * STRIPE_WIDTH, src, offs - 0 * step, size);
            for (int k = 0; k < STRIPE_WIDTH; ++k)
                dst[k] = pre_blur3_func(ptr[k - 6], ptr[k - 5], ptr[k - 4], ptr[k - 3],
                                        ptr[k - 2], ptr[k - 1], ptr[k]);
            dst += STRIPE_WIDTH;
            offs += STRIPE_WIDTH;
        }
    }
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.