[PATCH AUTOSEL 5.12 098/102] perf/x86/intel/uncore: Clean up error handling path of iio mapping

Sasha Levin
2021-07-14T19:48:12Z

From: Kan Liang <kan.liang@linux.intel.com>

[ Upstream commit d4ba0b06306a70c99a43f9d452886a86e2d3bd26 ]

The error handling path of iio mapping looks fragile. We already fixed
one issue caused by it, commit f797f05d917f ("perf/x86/intel/uncore:
Fix for iio mapping on Skylake Server"). Clean up the error handling
path and make the code robust.

Reported-by: gushengxian <gushengxian@yulong.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/40e66cf9-398b-20d7-ce4d-433be6e08921@linux.intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/events/intel/uncore_snbep.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 9e1f64bc988b..f1c5d7cb7253 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -3795,11 +3795,11 @@ static int skx_iio_set_mapping(struct intel_uncore_type *type)
/* One more for NULL. */
attrs = kcalloc((uncore_max_dies() + 1), sizeof(*attrs), GFP_KERNEL);
if (!attrs)
- goto err;
+ goto clear_topology;

eas = kcalloc(uncore_max_dies(), sizeof(*eas), GFP_KERNEL);
if (!eas)
- goto err;
+ goto clear_attrs;

for (die = 0; die < uncore_max_dies(); die++) {
sprintf(buf, "die%ld", die);
@@ -3820,7 +3820,9 @@ static int skx_iio_set_mapping(struct intel_uncore_type *type)
for (; die >= 0; die--)
kfree(eas[die].attr.attr.name);
kfree(eas);
+clear_attrs:
kfree(attrs);
+clear_topology:
kfree(type->topology);
clear_attr_update:
type->attr_update = NULL;
--
2.30.2