linux-kernel - [PATCH] intel_cacheinfo: fix use-after-free cache

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Date:	Tue, 15 Jul 2008 17:09:03 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH] intel_cacheinfo: fix use-after-free cache_kobject

This avoids calling kobject_uevent() with cache_kobject that has
already been deallocated in an error path.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
---
 arch/x86/kernel/cpu/intel_cacheinfo.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Index: 2.6-mmotm/arch/x86/kernel/cpu/intel_cacheinfo.c
===================================================================
--- 2.6-mmotm.orig/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ 2.6-mmotm/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -780,15 +780,14 @@ static int __cpuinit cache_add_dev(struc
 			}
 			kobject_put(per_cpu(cache_kobject, cpu));
 			cpuid4_cache_sysfs_exit(cpu);
-			break;
+			return retval;
 		}
 		kobject_uevent(&(this_object->kobj), KOBJ_ADD);
 	}
-	if (!retval)
-		cpu_set(cpu, cache_dev_map);
+	cpu_set(cpu, cache_dev_map);
 
 	kobject_uevent(per_cpu(cache_kobject, cpu), KOBJ_ADD);
-	return retval;
+	return 0;
 }
 
 static void __cpuinit cache_remove_dev(struct sys_device * sys_dev)
--
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