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authorBjorn Helgaas <bjorn.helgaas@hp.com>2008-06-27 16:57:12 -0600
committerAndi Kleen <andi@basil.nowhere.org>2008-07-16 23:27:07 +0200
commitfe2cf598e6942abd8fb70fee230d74b1a1eae0d1 (patch)
tree9b812788832205f05d2d1cf3bdb654702a7824d0 /drivers/pnp/pnpacpi
parentc227536b4cc2600fc9d22ba0067f699165f6621f (diff)
downloadlinux-linaro-stable-fe2cf598e6942abd8fb70fee230d74b1a1eae0d1.tar.gz
PNPACPI: ignore _PRS interrupt numbers larger than PNP_IRQ_NR
ACPI Extended Interrupt Descriptors can encode 32-bit interrupt numbers, so an interrupt number may exceed the size of the bitmap we use to track possible IRQ settings. To avoid corrupting memory, complain and ignore too-large interrupt numbers. There's similar code in pnpacpi_parse_irq_option(), but I didn't change that because the small IRQ descriptor can only encode IRQs 0-15, which do not exceed bitmap size. In the future, we could handle IRQ numbers greater than PNP_IRQ_NR by replacing the bitmap with a table or list. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Rene Herman <rene.herman@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/pnp/pnpacpi')
-rw-r--r--drivers/pnp/pnpacpi/rsparser.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
index 3aaf406b67b8..851c773feae1 100644
--- a/drivers/pnp/pnpacpi/rsparser.c
+++ b/drivers/pnp/pnpacpi/rsparser.c
@@ -455,9 +455,16 @@ static __init void pnpacpi_parse_ext_irq_option(struct pnp_dev *dev,
return;
bitmap_zero(map.bits, PNP_IRQ_NR);
- for (i = 0; i < p->interrupt_count; i++)
- if (p->interrupts[i])
- __set_bit(p->interrupts[i], map.bits);
+ for (i = 0; i < p->interrupt_count; i++) {
+ if (p->interrupts[i]) {
+ if (p->interrupts[i] < PNP_IRQ_NR)
+ __set_bit(p->interrupts[i], map.bits);
+ else
+ dev_err(&dev->dev, "ignoring IRQ %d option "
+ "(too large for %d entry bitmap)\n",
+ p->interrupts[i], PNP_IRQ_NR);
+ }
+ }
flags = irq_flags(p->triggering, p->polarity, p->sharable);
pnp_register_irq_resource(dev, option, &map, flags);