diff options
| author | Kan Liang <kan.liang@linux.intel.com> | 2023-01-12 12:01:02 -0800 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-01-21 00:06:12 +0100 |
| commit | 3af548f2361077cd53762c88d62343d4e8ea1efb (patch) | |
| tree | e1769d93026baa1027fb893711c7f04a0090baee /arch/x86/events | |
| parent | dbf061b26221fa1a99e6489dd61f5b4ee97a24e8 (diff) | |
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
Diffstat (limited to 'arch/x86/events')
| -rw-r--r-- | arch/x86/events/intel/uncore.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c index eeaa92f06b44..271c01621303 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)); } } |