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-rw-r--r--src/test/rng_test_helpers.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/test/rng_test_helpers.c b/src/test/rng_test_helpers.c
index 262d380bda..d268cb64b7 100644
--- a/src/test/rng_test_helpers.c
+++ b/src/test/rng_test_helpers.c
@@ -185,10 +185,14 @@ testing_enable_prefilled_rng(const void *buffer, size_t buflen)
tor_assert(buflen > 0);
rng_mutex = tor_mutex_new();
+ tor_mutex_acquire(rng_mutex);
+
prefilled_rng_buffer = tor_memdup(buffer, buflen);
prefilled_rng_buflen = buflen;
prefilled_rng_idx = 0;
+ tor_mutex_release(rng_mutex);
+
MOCK(crypto_rand, crypto_rand_prefilled);
MOCK(crypto_strongest_rand_, mock_crypto_strongest_rand);
}