[tip:,perf/core] perf/x86/uncore: Fix potential NULL pointer in uncore_get_alias_name
Commit Message
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@linux.intel.com>
AuthorDate: Thu, 12 Jan 2023 12:01:02 -08:00
Committer: Peter Zijlstra <peterz@infradead.org>
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@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Petlan <mpetlan@redhat.com>
Link: https://lore.kernel.org/r/20230112200105.733466-3-kan.liang@linux.intel.com
---
arch/x86/events/intel/uncore.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
@@ -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));
}
}