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intel_agp: Don't oops with zero stolen memory

PATCH Superseded Ondrej Zary 1 participant 1 message Jun 14, 2010 Agpgart driver

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Ondrej Zary

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PATCH 1/1 intel_agp: Don't oops with zero stolen memory

When "onboard video memory" is set do "disabled" in BIOS on Asus P4P800-VM board (i865G), kernel oopses with memory corruption:
https://bugs.freedesktop.org/show_bug.cgi?id=28430

Fix that by cleanly aborting the initialization.

Signed-off-by Ondrej Zary <[email protected]>
drivers/char/agp/intel-gtt.c +14 -0
diff -urp linux-2.6.35-rc2-orig/drivers/char/agp/intel-gtt.c linux-2.6.35-rc2/drivers/char/agp/intel-gtt.c
@@ -797,6 +797,10 @@ static int intel_i830_create_gatt_table(
 
 	/* we have to call this as early as possible after the MMIO base address is known */
 	intel_i830_init_gtt_entries();
+	if (intel_private.gtt_entries == 0) {
+		iounmap(intel_private.registers);
+		return -ENOMEM;
+	}
 
 	agp_bridge->gatt_table = NULL;
 

@@ -1279,6 +1283,11 @@ static int intel_i915_create_gatt_table(
 
 	/* we have to call this as early as possible after the MMIO base address is known */
 	intel_i830_init_gtt_entries();
+	if (intel_private.gtt_entries == 0) {
+		iounmap(intel_private.gtt);
+		iounmap(intel_private.registers);
+		return -ENOMEM;
+	}
 
 	agp_bridge->gatt_table = NULL;
 

@@ -1387,6 +1396,11 @@ static int intel_i965_create_gatt_table(
 
 	/* we have to call this as early as possible after the MMIO base address is known */
 	intel_i830_init_gtt_entries();
+	if (intel_private.gtt_entries == 0) {
+		iounmap(intel_private.gtt);
+		iounmap(intel_private.registers);
+		return -ENOMEM;
+	}
 
 	agp_bridge->gatt_table = NULL;
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Ondrej Zary