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authorKan Liang <kan.liang@linux.intel.com>2023-01-12 12:01:02 -0800
committerPeter Zijlstra <peterz@infradead.org>2023-01-21 00:06:12 +0100
commit3af548f2361077cd53762c88d62343d4e8ea1efb (patch)
treee1769d93026baa1027fb893711c7f04a0090baee /arch/x86/events
parentdbf061b26221fa1a99e6489dd61f5b4ee97a24e8 (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.c10
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));
}
}