linux-kernel - x86: Fix leak in uncore_type

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Message-ID: <20140306172028.GA552@redhat.com>
Date:	Thu, 6 Mar 2014 12:20:28 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Subject: x86: Fix leak in uncore_type_init failure paths

The error path of uncore_type_init() frees up any allocations that were made
along the way, but it relies upon type->pmus being set, which only happens
if the function succeeds. As type->pmus remains null in this case, the call
to uncore_type_exit will do nothing.

Moving the assignment earlier will allow us to actually free those allocations
should something go awry.

Signed-off-by: Dave Jones <davej@...oraproject.org>

diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index c88f7f4b03ee..047f540cf3f7 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -3334,6 +3334,8 @@ static int __init uncore_type_init(struct intel_uncore_type *type)
 	if (!pmus)
 		return -ENOMEM;
 
+	type->pmus = pmus;
+
 	type->unconstrainted = (struct event_constraint)
 		__EVENT_CONSTRAINT(0, (1ULL << type->num_counters) - 1,
 				0, type->num_counters, 0, 0);
@@ -3369,7 +3371,6 @@ static int __init uncore_type_init(struct intel_uncore_type *type)
 	}
 
 	type->pmu_group = &uncore_pmu_attr_group;
-	type->pmus = pmus;
 	return 0;
 fail:
 	uncore_type_exit(type);
--
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