static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
{
	struct uvesafb_par *par = info->par;
	int err = 0;

	if (noedid || par->vbe_ib.vbe_version < 0x0300)
		return -EINVAL;

	task->t.regs.eax = 0x4f15;
	task->t.regs.ebx = 0;
	task->t.regs.ecx = 0;
	task->t.buf_len = 0;
	task->t.flags = 0;

	err = uvesafb_exec(task);

	if ((task->t.regs.eax & 0xffff) != 0x004f || err)
		return -EINVAL;

	if ((task->t.regs.ebx & 0x3) == 3) {
		pr_info("VBIOS/hardware supports both DDC1 and DDC2 transfers\n");
	} else if ((task->t.regs.ebx & 0x3) == 2) {
		pr_info("VBIOS/hardware supports DDC2 transfers\n");
	} else if ((task->t.regs.ebx & 0x3) == 1) {
		pr_info("VBIOS/hardware supports DDC1 transfers\n");
	} else {
		pr_info("VBIOS/hardware doesn't support DDC transfers\n");
		return -EINVAL;
	}

	task->t.regs.eax = 0x4f15;
	task->t.regs.ebx = 1;
	task->t.regs.ecx = task->t.regs.edx = 0;
	task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
	task->t.buf_len = EDID_LENGTH;
	task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
	if (!task->buf)
		return -ENOMEM;

	err = uvesafb_exec(task);

	if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
		fb_edid_to_monspecs(task->buf, &info->monspecs);

		if (info->monspecs.vfmax && info->monspecs.hfmax) {
			/*
			 * If the maximum pixel clock wasn't specified in
			 * the EDID block, set it to 300 MHz.
			 */
			if (info->monspecs.dclkmax == 0)
				info->monspecs.dclkmax = 300 * 1000000;
			info->monspecs.gtf = 1;
		}
	} else {
		err = -EINVAL;
	}

	kfree(task->buf);
	return err;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.