s390/cpum_sf: ensure sample frequency of perf event attributes is non-zero

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commit 4bbaf2584b upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Hendrik Brueckner 2018-05-03 15:56:15 +02:00 • committed by Greg Kroah-Hartman

parent c568bdf37b

commit 56130d9322

1 changed files with 4 additions and 0 deletions

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arch/s390/kernel/perf_cpum_sf.c

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