x86: Fix leak in uncore_type_init failure paths

x86: Fix leak in uncore_type_init failure paths

[Dave Jones]

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@fedoraproject.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);

[tip:perf/urgent] perf/x86: Fix leak in uncore_type_init failure paths

[tip-bot for Dave Jones]

Commit-ID:  b7b4839d93e50adccef29eccb694807cdcb8bee3
Gitweb:     http://git.kernel.org/tip/b7b4839d93e50adccef29eccb694807cdcb8bee3
Author:     Dave Jones <davej@redhat.com>
AuthorDate: Thu, 6 Mar 2014 12:20:28 -0500
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 11 Mar 2014 11:59:34 +0100

perf/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@fedoraproject.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140306172028.GA552@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/perf_event_intel_uncore.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index c88f7f4..047f540 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);