s390/cpum_sf: Fix and protect memory allocation of SDBs with mutex

Reservation of the PMU hardware is done at first event creation
and is protected by a pair of mutex_lock() and mutex_unlock().
After reservation of the PMU hardware the memory
required for the PMUs the event is to be installed on is
allocated by allocate_buffers() and alloc_sampling_buffer().
This done outside of the mutex protection.
Without mutex protection two or more concurrent invocations of
perf_event_init() may run in parallel.
This can lead to allocation of Sample Data Blocks (SDBs)
multiple times for the same PMU.
Prevent this and protect memory allocation of SDBs by
mutex.

Fixes: 8a6fe8f21ec4 ("s390/cpum_sf: Use refcount_t instead of atomic_t")
Signed-off-by: Thomas Richter <[email protected]>
Reviewed-by: Sumanth Korikkar <[email protected]>
Reviewed-by: Hendrik Brueckner <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 2c1d4188e987..72c73cfa648f 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -758,7 +758,6 @@ static int __hw_perf_event_init(struct perf_event *event)
 		reserve_pmc_hardware();
 		refcount_set(&num_events, 1);
 	}
-	mutex_unlock(&pmc_reserve_mutex);
 	event->destroy = hw_perf_event_destroy;
 
 	/* Access per-CPU sampling information (query sampling info) */
@@ -847,6 +846,7 @@ static int __hw_perf_event_init(struct perf_event *event)
 		if (is_default_overflow_handler(event))
 			event->overflow_handler = cpumsf_output_event_pid;
 out:
+	mutex_unlock(&pmc_reserve_mutex);
 	return err;
 }