Messages in this thread Patch in this message | | | From | Len Brown <> | Subject | [stable PATCH for 2.6.24.5 and 2.6.25] pnpacpi: fix potential corruption on "pnpacpi: exceeded the max number of IRQ resources 2" | Date | Wed, 23 Apr 2008 00:09:13 -0400 |
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From: Len Brown <len.brown@intel.com>
PNP_MAX_IRQ is 2 If a device invokes pnpacpi_parse_allocated_irqresource() 0, 1, or 2 times, we are happy. The 3rd time, we will fail and print "pnpacpi: exceeded the max number of IRQ resources: 2" The 4th and subsequent calls (if this ever happened) would silently scribble on irq_resource[2], which doesn't actualy exist.
Found-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c index 2dcd196..98cbc9f 100644 --- a/drivers/pnp/pnpacpi/rsparser.c +++ b/drivers/pnp/pnpacpi/rsparser.c @@ -84,10 +84,12 @@ static void pnpacpi_parse_allocated_irqresource(struct pnp_resource_table *res, while (!(res->irq_resource[i].flags & IORESOURCE_UNSET) && i < PNP_MAX_IRQ) i++; - if (i >= PNP_MAX_IRQ && !warned) { - printk(KERN_WARNING "pnpacpi: exceeded the max number of IRQ " - "resources: %d \n", PNP_MAX_IRQ); - warned = 1; + if (i >= PNP_MAX_IRQ) { + if (!warned) { + printk(KERN_WARNING "pnpacpi: exceeded the max number" + " of IRQ resources: %d\n", PNP_MAX_IRQ); + warned = 1; + } return; } /*
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