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author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2008-08-01 15:58:17 -0600 |
---|---|---|
committer | Andi Kleen <ak@linux.intel.com> | 2008-08-15 03:17:07 +0200 |
commit | fa46d3526461e8aa7c0fb39cc1b98ac656695a43 (patch) | |
tree | 0094d2a1ff5782cdf6f65dcdf8c7c54e0e1bded9 /Documentation/hayes-esp.txt | |
parent | b635acec48bcaa9183fcbf4e3955616b0d4119b5 (diff) |
ACPI: bounds check IRQ to prevent memory corruption
acpi_penalize_isa_irq() should validate irq before using it to
index the acpi_irq_penalty[] table.
Here's the path I'm concerned about:
pnpacpi_parse_allocated_irqresource()
{
...
irq = acpi_register_gsi(gsi, triggering, polarity);
if (irq >= 0)
pcibios_penalize_isa_irq(irq, 1);
There's no guarantee that acpi_register_gsi() will return an IRQ
within the bounds of acpi_irq_penalty[].
I have not seen a failure I can attribute to this. However,
ACPI_MAX_IRQS is only 256, and I'm pretty sure ia64 can have
IRQs larger than that.
I think this should go in 2.6.27.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'Documentation/hayes-esp.txt')
0 files changed, 0 insertions, 0 deletions