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Subject[tip:perf/core] perf/x86/amd/uncore: Plug reference leak
Commit-ID:  8bc9162cd2bf37036c486b384ac445b59b334b04
Gitweb: http://git.kernel.org/tip/8bc9162cd2bf37036c486b384ac445b59b334b04
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Tue, 16 Feb 2016 23:04:41 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 17 Feb 2016 08:36:09 +0100

perf/x86/amd/uncore: Plug reference leak

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@linutronix.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1602162302170.19512@nanos
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/cpu/perf_event_amd_uncore.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/cpu/perf_event_amd_uncore.c b/arch/x86/kernel/cpu/perf_event_amd_uncore.c
index 4974274..8836fc9 100644
--- 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(unsigned int cpu)
return 0;

fail:
+ if (amd_uncore_nb)
+ *per_cpu_ptr(amd_uncore_nb, cpu) = NULL;
kfree(uncore_nb);
return -ENOMEM;
}
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