s390/cpum_sf: ensure sample frequency of perf event attributes is non-zero
Correct a trinity finding for the perf_event_open() system call with
a perf event attribute structure that uses a frequency but has the
sampling frequency set to zero. This causes a FP divide exception during
the sample rate initialization for the hardware sampling facility.
Fixes: 8c069ff4bd
("s390/perf: add support for the CPU-Measurement Sampling Facility")
Cc: stable@vger.kernel.org # 3.14+
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -753,6 +753,10 @@ static int __hw_perf_event_init(struct perf_event *event)
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*/
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rate = 0;
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if (attr->freq) {
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if (!attr->sample_freq) {
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err = -EINVAL;
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goto out;
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}
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rate = freq_to_sample_rate(&si, attr->sample_freq);
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rate = hw_limit_rate(&si, rate);
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attr->freq = 0;
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