[tip: perf/core] perf/x86/uncore: Fix potential NULL pointer in uncore_get_alias_name

[tip-bot2 for Kan Liang]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     3af548f2361077cd53762c88d62343d4e8ea1efb
Gitweb:        https://git.kernel.org/tip/3af548f2361077cd53762c88d62343d4e8ea1efb
Author:        Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
AuthorDate:    Thu, 12 Jan 2023 12:01:02 -08:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Sat, 21 Jan 2023 00:06:12 +01:00

perf/x86/uncore: Fix potential NULL pointer in uncore_get_alias_name

The current code assumes that the discovery table provides valid
box_ids for the normal units. It's not the case anymore since some units
in the discovery table are broken on some SPR variants.

Factor out uncore_get_box_id(). Check the existence of the type->box_ids
before using it. If it's not available, use pmu_idx.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Michael Petlan <mpetlan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230112200105.733466-3-kan.liang@xxxxxxxxxxxxxxx
---
 arch/x86/events/intel/uncore.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index eeaa92f..271c016 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -857,6 +857,12 @@ static const struct attribute_group uncore_pmu_attr_group = {
 	.attrs = uncore_pmu_attrs,
 };
 
+static inline int uncore_get_box_id(struct intel_uncore_type *type,
+				    struct intel_uncore_pmu *pmu)
+{
+	return type->box_ids ? type->box_ids[pmu->pmu_idx] : pmu->pmu_idx;
+}
+
 void uncore_get_alias_name(char *pmu_name, struct intel_uncore_pmu *pmu)
 {
 	struct intel_uncore_type *type = pmu->type;
@@ -865,7 +871,7 @@ void uncore_get_alias_name(char *pmu_name, struct intel_uncore_pmu *pmu)
 		sprintf(pmu_name, "uncore_type_%u", type->type_id);
 	else {
 		sprintf(pmu_name, "uncore_type_%u_%d",
-			type->type_id, type->box_ids[pmu->pmu_idx]);
+			type->type_id, uncore_get_box_id(type, pmu));
 	}
 }
 
@@ -892,7 +898,7 @@ static void uncore_get_pmu_name(struct intel_uncore_pmu *pmu)
 		 * Use the box ID from the discovery table if applicable.
 		 */
 		sprintf(pmu->name, "uncore_%s_%d", type->name,
-			type->box_ids ? type->box_ids[pmu->pmu_idx] : pmu->pmu_idx);
+			uncore_get_box_id(type, pmu));
 	}
 }