[PATCH v3 5/8] sparc64: validate Fire register properties before initialization

[Magnus Lindholm <linmag7@gmail.com>]

The Fire interrupt translator reads one reg entry, and PCI PBM setup
reads two, without checking that the firmware supplied enough data.

Check the property before allocating the translator or changing PBM
state. Halt early translation on invalid firmware data rather than leave
raw interrupt numbers untranslated. Return an error from PBM setup so
probe can release its allocations.

Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
---
 arch/sparc/kernel/pci_fire.c      | 9 +++++++--
 arch/sparc/kernel/prom_irqtrans.c | 8 +++++++-
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/sparc/kernel/pci_fire.c b/arch/sparc/kernel/pci_fire.c
index c35a8e3c1eae..db160eeb0ffe 100644
--- a/arch/sparc/kernel/pci_fire.c
+++ b/arch/sparc/kernel/pci_fire.c
@@ -416,7 +416,13 @@ static int pci_fire_pbm_init(struct pci_pbm_info *pbm,
 {
 	const struct linux_prom64_registers *regs;
 	struct device_node *dp = op->dev.of_node;
-	int err;
+	int err, len;
+
+	regs = of_get_property(dp, "reg", &len);
+	if (!regs || len < 2 * sizeof(*regs)) {
+		dev_err(&op->dev, "missing or short reg property\n");
+		return -EINVAL;
+	}
 
 	pbm->numa_node = NUMA_NO_NODE;
 
@@ -429,7 +435,6 @@ static int pci_fire_pbm_init(struct pci_pbm_info *pbm,
 	pbm->op = op;
 	pbm->name = dp->full_name;
 
-	regs = of_get_property(dp, "reg", NULL);
 	pbm->pbm_regs = regs[0].phys_addr;
 	pbm->controller_regs = regs[1].phys_addr - 0x410000UL;
 
diff --git a/arch/sparc/kernel/prom_irqtrans.c b/arch/sparc/kernel/prom_irqtrans.c
index 5752bfd73ac0..558ed5114664 100644
--- a/arch/sparc/kernel/prom_irqtrans.c
+++ b/arch/sparc/kernel/prom_irqtrans.c
@@ -544,13 +544,19 @@ static void __init fire_irq_trans_init(struct device_node *dp)
 {
 	const struct linux_prom64_registers *regs;
 	struct fire_irq_data *irq_data;
+	int len;
+
+	regs = of_get_property(dp, "reg", &len);
+	if (!regs || len < sizeof(*regs)) {
+		prom_printf("%s: missing or short reg property.\n", dp->full_name);
+		prom_halt();
+	}
 
 	dp->irq_trans = prom_early_alloc(sizeof(struct of_irq_controller));
 	dp->irq_trans->irq_build = fire_irq_build;
 
 	irq_data = prom_early_alloc(sizeof(struct fire_irq_data));
 
-	regs = of_get_property(dp, "reg", NULL);
 	dp->irq_trans->data = irq_data;
 
 	irq_data->pbm_regs = regs[0].phys_addr;