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drivers/char: for hpet, add count checking, and ~0UL instead of -1 

use ~0UL for unsigned long variable initialization, instead of -1.

  add check for hdp->hd_nirqs within 32 (HPET_MAX_TIMERS).
    the type of irqp->interrupt_count is u8.
    the git diff not display the relative lines below.
      hdp->hd_irq[hdp->hd_nirqs] = irq;
      hdp->hd_nirqs++;
    please check source code to get more information.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chen Gang 2012-11-23 17:46:43 +08:00 committed by Greg Kroah-Hartman
parent 8a1861d997
commit 2cf4e52e27
1 changed files with 4 additions and 1 deletions
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5
drivers/char/hpet.c
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@ -816,7 +816,7 @@ static unsigned long __hpet_calibrate(struct hpets *hpetp)
static unsigned long hpet_calibrate(struct hpets *hpetp)
{
unsigned long ret = -1;
unsigned long ret = ~0UL;
unsigned long tmp;
/*
@ -1001,6 +1001,9 @@ static acpi_status hpet_resources(struct acpi_resource *res, void *data)
irqp = &res->data.extended_irq;
for (i = 0; i < irqp->interrupt_count; i++) {
if (hdp->hd_nirqs >= HPET_MAX_TIMERS)
break;
irq = acpi_register_gsi(NULL, irqp->interrupts[i],
irqp->triggering, irqp->polarity);
if (irq < 0)