linux-kernel - [PATCH] x86/perf/amd_uncore: Plug reference leak

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Date:	Tue, 16 Feb 2016 23:04:41 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	LKML <linux-kernel@...r.kernel.org>
cc:	Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
	Jacob Shin <jacob.shin@....com>, Borislav Petkov <bp@...en8.de>
Subject: [PATCH] x86/perf/amd_uncore: Plug reference leak

Subject: x86/perf/amd_uncore: Plug reference leak
From: Thomas Gleixner <tglx@...utronix.de>
Date: Wed, 03 Feb 2016 09:38:31 +0100

In the error path of amd_uncore_cpu_up_prepare() the newly allocated uncore
struct is freed, but the percpu pointer still references it. Set it to NULL.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/cpu/perf_event_amd_uncore.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/x86/kernel/cpu/perf_event_amd_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_amd_uncore.c
@@ -323,6 +323,8 @@ static int amd_uncore_cpu_up_prepare(uns
 	return 0;
 
 fail:
+	if (amd_uncore_nb)
+		*per_cpu_ptr(amd_uncore_nb, cpu) = NULL;
 	kfree(uncore_nb);
 	return -ENOMEM;
 }