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

Counting with invalid event coding for free-running counter may cause OOPs, e.g. uncore_iio_free_running_0/event=1/.

Current code only validate the event with free-running event format, event=0xff,umask=0xXY. Non-free-running event format never be checked for the PMU with free-running counters.

Add generic hw_config() to check and reject the invalid event coding for free-running PMU.

Fixes: 0f519f0352e3 ("perf/x86/intel/uncore: Support IIO free-running counters on SKX") Signed-off-by: Kan Liang kan.liang@linux.intel.com Cc: stable@vger.kernel.org --- arch/x86/events/intel/uncore.h | 10 ++++++++++ arch/x86/events/intel/uncore_snbep.c | 1 + 2 files changed, 11 insertions(+)

diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h index 79eb2e2..28499e3 100644 --- a/arch/x86/events/intel/uncore.h +++ b/arch/x86/events/intel/uncore.h @@ -419,6 +419,16 @@ static inline bool is_freerunning_event(struct perf_event *event) (((cfg >> 8) & 0xff) >= UNCORE_FREERUNNING_UMASK_START); }

+/* Check and reject invalid config */ +static inline int uncore_freerunning_hw_config(struct intel_uncore_box *box, + struct perf_event *event) +{ + if (is_freerunning_event(event)) + return 0; + + return -EINVAL; +} + static inline void uncore_disable_box(struct intel_uncore_box *box) { if (box->pmu->type->ops->disable_box) diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c index b10e043..8e4e8e4 100644 --- a/arch/x86/events/intel/uncore_snbep.c +++ b/arch/x86/events/intel/uncore_snbep.c @@ -3585,6 +3585,7 @@ static struct uncore_event_desc skx_uncore_iio_freerunning_events[] = {

static struct intel_uncore_ops skx_uncore_iio_freerunning_ops = { .read_counter = uncore_msr_read_counter, + .hw_config = uncore_freerunning_hw_config, };

static struct attribute *skx_uncore_iio_freerunning_formats_attr[] = {