[PATCH] x86/perf/amd_uncore: Plug reference leak

[Thomas Gleixner]

Subject: x86/perf/amd_uncore: Plug reference leak
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
---
 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;
 }