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| author | Chen Gang <gang.chen@asianux.com> | 2012-11-23 17:46:43 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-26 16:16:35 -0800 |
| commit | 2cf4e52e27dc719941cd3727205ca62b742f2746 (patch) | |
| tree | 54884dce9987d7582b4c3cb854606054860c4e88 | |
| parent | 8a1861d997d698a120401f3c125085679f729d64 (diff) | |
| download | linux-stable-2cf4e52e27dc719941cd3727205ca62b742f2746.tar.gz linux-stable-2cf4e52e27dc719941cd3727205ca62b742f2746.tar.bz2 linux-stable-2cf4e52e27dc719941cd3727205ca62b742f2746.zip | |
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>
| -rw-r--r-- | drivers/char/hpet.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c index dfd7876f127c..fe6d4be48296 100644 --- a/drivers/char/hpet.c +++ b/drivers/char/hpet.c @@ -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) |