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| author | Hendrik Brueckner <brueckner@linux.ibm.com> | 2018-05-03 15:56:15 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-05-08 15:56:36 +0200 |
| commit | 4bbaf2584b86b0772413edeac22ff448f36351b1 (patch) | |
| tree | 1d1189bb322ed2104b9c3d7560a1a151942aef88 | |
| parent | de5cb6eb514ebe241e3edeb290cb41deb380b81d (diff) | |
| download | linux-4bbaf2584b86b0772413edeac22ff448f36351b1.tar.gz linux-4bbaf2584b86b0772413edeac22ff448f36351b1.tar.bz2 linux-4bbaf2584b86b0772413edeac22ff448f36351b1.zip | |
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: 8c069ff4bd606 ("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>
| -rw-r--r-- | arch/s390/kernel/perf_cpum_sf.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index 1c9ddd7aa5ec..0292d68e7dde 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -753,6 +753,10 @@ static int __hw_perf_event_init(struct perf_event *event) */ rate = 0; if (attr->freq) { + if (!attr->sample_freq) { + err = -EINVAL; + goto out; + } rate = freq_to_sample_rate(&si, attr->sample_freq); rate = hw_limit_rate(&si, rate); attr->freq = 0; |