s390/pai: Prevent invalid event number for pai_crypto PMU

The pai_crypto PMU has to check the event number. It has to be in
the supported range. This is not the case, the lower limit is not
checked. Fix this and obey the lower limit.

Fixes: 8f4b75febd0a ("s390/pai: add support for cryptography counters")
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Suggested-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Reviewed-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

diff --git a/arch/s390/kernel/perf_pai_crypto.c b/arch/s390/kernel/perf_pai_crypto.c
index 8c1545946d85e79854d2d5249bac96521c61f6cc..188c6cf09c7a2bea97590e76bbe4ef9bd8af2dd7 100644 (file)
--- a/arch/s390/kernel/perf_pai_crypto.c
+++ b/arch/s390/kernel/perf_pai_crypto.c
@@ -193,8 +193,9 @@ static int paicrypt_event_init(struct perf_event *event)
        /* PAI crypto PMU registered as PERF_TYPE_RAW, check event type */
        if (a->type != PERF_TYPE_RAW && event->pmu->type != a->type)
                return -ENOENT;
-       /* PAI crypto event must be valid */
-       if (a->config > PAI_CRYPTO_BASE + paicrypt_cnt)
+       /* PAI crypto event must be in valid range */
+       if (a->config < PAI_CRYPTO_BASE ||
+           a->config > PAI_CRYPTO_BASE + paicrypt_cnt)
                return -EINVAL;
        /* Allow only CPU wide operation, no process context for now. */
        if (event->hw.target || event->cpu == -1)