static int gpr32_set_common(struct task_struct *target,
		     const struct user_regset *regset,
		     unsigned int pos, unsigned int count,
		     const void *kbuf, const void __user *ubuf,
		     unsigned long *regs)
{
	const compat_ulong_t *k = kbuf;
	const compat_ulong_t __user *u = ubuf;
	compat_ulong_t reg;

	pos /= sizeof(reg);
	count /= sizeof(reg);

	if (kbuf)
		for (; count > 0 && pos < PT_MSR; --count)
			regs[pos++] = *k++;
	else
		for (; count > 0 && pos < PT_MSR; --count) {
			if (__get_user(reg, u++))
				return -EFAULT;
			regs[pos++] = reg;
		}


	if (count > 0 && pos == PT_MSR) {
		if (kbuf)
			reg = *k++;
		else if (__get_user(reg, u++))
			return -EFAULT;
		set_user_msr(target, reg);
		++pos;
		--count;
	}

	if (kbuf) {
		for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
			regs[pos++] = *k++;
		for (; count > 0 && pos < PT_TRAP; --count, ++pos)
			++k;
	} else {
		for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
			if (__get_user(reg, u++))
				return -EFAULT;
			regs[pos++] = reg;
		}
		for (; count > 0 && pos < PT_TRAP; --count, ++pos)
			if (__get_user(reg, u++))
				return -EFAULT;
	}

	if (count > 0 && pos == PT_TRAP) {
		if (kbuf)
			reg = *k++;
		else if (__get_user(reg, u++))
			return -EFAULT;
		set_user_trap(target, reg);
		++pos;
		--count;
	}

	kbuf = k;
	ubuf = u;
	pos *= sizeof(reg);
	count *= sizeof(reg);
	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
					 (PT_TRAP + 1) * sizeof(reg), -1);
}

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.