static int set_dac(struct task_struct *child, struct ppc_hw_breakpoint *bp_info)
{
	int byte_enable =
		(bp_info->condition_mode >> PPC_BREAKPOINT_CONDITION_BE_SHIFT)
		& 0xf;
	int condition_mode =
		bp_info->condition_mode & PPC_BREAKPOINT_CONDITION_MODE;
	int slot;

	if (byte_enable && (condition_mode == 0))
		return -EINVAL;

	if (bp_info->addr >= TASK_SIZE)
		return -EIO;

	if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0) {
		slot = 1;
		if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
			dbcr_dac(child) |= DBCR_DAC1R;
		if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
			dbcr_dac(child) |= DBCR_DAC1W;
		child->thread.debug.dac1 = (unsigned long)bp_info->addr;
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
		if (byte_enable) {
			child->thread.debug.dvc1 =
				(unsigned long)bp_info->condition_value;
			child->thread.debug.dbcr2 |=
				((byte_enable << DBCR2_DVC1BE_SHIFT) |
				 (condition_mode << DBCR2_DVC1M_SHIFT));
		}
#endif
#ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
	} else if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE) {
		/* Both dac1 and dac2 are part of a range */
		return -ENOSPC;
#endif
	} else if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0) {
		slot = 2;
		if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
			dbcr_dac(child) |= DBCR_DAC2R;
		if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
			dbcr_dac(child) |= DBCR_DAC2W;
		child->thread.debug.dac2 = (unsigned long)bp_info->addr;
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
		if (byte_enable) {
			child->thread.debug.dvc2 =
				(unsigned long)bp_info->condition_value;
			child->thread.debug.dbcr2 |=
				((byte_enable << DBCR2_DVC2BE_SHIFT) |
				 (condition_mode << DBCR2_DVC2M_SHIFT));
		}
#endif
	} else
		return -ENOSPC;
	child->thread.debug.dbcr0 |= DBCR0_IDM;
	child->thread.regs->msr |= MSR_DE;

	return slot + 4;
}

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.