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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Alexander Antonov <alexander.antonov@linux.intel.com>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Kan Liang <kan.liang@linux.intel.com>
Subject: [PATCH 5.14 309/334] perf/x86/intel/uncore: Fix IIO cleanup mapping procedure for SNR/ICX
Date:   Mon, 13 Sep 2021 15:16:03 +0200
Message-Id: <20210913131123.873839850@linuxfoundation.org>
In-Reply-To: <20210913131113.390368911@linuxfoundation.org>
References: <20210913131113.390368911@linuxfoundation.org>
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From: Alexander Antonov <alexander.antonov@linux.intel.com>

commit 3f2cbe3810a60111a33f5f6267bd5a237b826fc9 upstream.

skx_iio_cleanup_mapping() is re-used for snr and icx, but in those
cases it fails to use the appropriate XXX_iio_mapping_group and as
such fails to free previously allocated resources, leading to memory
leaks.

Fixes: 10337e95e04c ("perf/x86/intel/uncore: Enable I/O stacks to IIO PMON mapping on ICX")
Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com>
[peterz: Changelog]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210706090723.41850-1-alexander.antonov@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/events/intel/uncore_snbep.c |   40 ++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 12 deletions(-)

--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -3838,26 +3838,32 @@ clear_attr_update:
 	return ret;
 }
 
-static int skx_iio_set_mapping(struct intel_uncore_type *type)
-{
-	return pmu_iio_set_mapping(type, &skx_iio_mapping_group);
-}
-
-static void skx_iio_cleanup_mapping(struct intel_uncore_type *type)
+static void
+pmu_iio_cleanup_mapping(struct intel_uncore_type *type, struct attribute_group *ag)
 {
-	struct attribute **attr = skx_iio_mapping_group.attrs;
+	struct attribute **attr = ag->attrs;
 
 	if (!attr)
 		return;
 
 	for (; *attr; attr++)
 		kfree((*attr)->name);
-	kfree(attr_to_ext_attr(*skx_iio_mapping_group.attrs));
-	kfree(skx_iio_mapping_group.attrs);
-	skx_iio_mapping_group.attrs = NULL;
+	kfree(attr_to_ext_attr(*ag->attrs));
+	kfree(ag->attrs);
+	ag->attrs = NULL;
 	kfree(type->topology);
 }
 
+static int skx_iio_set_mapping(struct intel_uncore_type *type)
+{
+	return pmu_iio_set_mapping(type, &skx_iio_mapping_group);
+}
+
+static void skx_iio_cleanup_mapping(struct intel_uncore_type *type)
+{
+	pmu_iio_cleanup_mapping(type, &skx_iio_mapping_group);
+}
+
 static struct intel_uncore_type skx_uncore_iio = {
 	.name			= "iio",
 	.num_counters		= 4,
@@ -4501,6 +4507,11 @@ static int snr_iio_set_mapping(struct in
 	return pmu_iio_set_mapping(type, &snr_iio_mapping_group);
 }
 
+static void snr_iio_cleanup_mapping(struct intel_uncore_type *type)
+{
+	pmu_iio_cleanup_mapping(type, &snr_iio_mapping_group);
+}
+
 static struct intel_uncore_type snr_uncore_iio = {
 	.name			= "iio",
 	.num_counters		= 4,
@@ -4517,7 +4528,7 @@ static struct intel_uncore_type snr_unco
 	.attr_update		= snr_iio_attr_update,
 	.get_topology		= snr_iio_get_topology,
 	.set_mapping		= snr_iio_set_mapping,
-	.cleanup_mapping	= skx_iio_cleanup_mapping,
+	.cleanup_mapping	= snr_iio_cleanup_mapping,
 };
 
 static struct intel_uncore_type snr_uncore_irp = {
@@ -5092,6 +5103,11 @@ static int icx_iio_set_mapping(struct in
 	return pmu_iio_set_mapping(type, &icx_iio_mapping_group);
 }
 
+static void icx_iio_cleanup_mapping(struct intel_uncore_type *type)
+{
+	pmu_iio_cleanup_mapping(type, &icx_iio_mapping_group);
+}
+
 static struct intel_uncore_type icx_uncore_iio = {
 	.name			= "iio",
 	.num_counters		= 4,
@@ -5109,7 +5125,7 @@ static struct intel_uncore_type icx_unco
 	.attr_update		= icx_iio_attr_update,
 	.get_topology		= icx_iio_get_topology,
 	.set_mapping		= icx_iio_set_mapping,
-	.cleanup_mapping	= skx_iio_cleanup_mapping,
+	.cleanup_mapping	= icx_iio_cleanup_mapping,
 };
 
 static struct intel_uncore_type icx_uncore_irp = {