Commit 541a4966 authored by Thomas Richter's avatar Thomas Richter Committed by Alexander Gordeev
Browse files

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: 39d62336 ("s390/pai: add support for cryptography counters")

Signed-off-by: default avatarThomas Richter <tmricht@linux.ibm.com>
Suggested-by: default avatarSumanth Korikkar <sumanthk@linux.ibm.com>
Reviewed-by: default avatarSumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
parent be857b7f

arch/s390/kernel/perf_pai_crypto.c

+3 −2
Original line number Diff line number Diff line
@@ -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)