From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> [ Upstream commit b81e286ba154a4e0f01a94d99179a97f4ba3e396 ] As algorithm testing is carried out without holding the main crypto lock, it is always possible for the algorithm to go away during the test. So before crypto_alg_tested updates the status of the tested alg, it checks whether it's still on the list of all algorithms. This is inaccurate because it may be off the main list but still on the list of algorithms to be removed. Updating the algorithm status is safe per se as the larval still holds a reference to it. However, killing spawns of other algorithms that are of lower priority is clearly a deficiency as it adds unnecessary churn. Fix the test by checking whether the algorithm is dead. Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- crypto/algapi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/crypto/algapi.c b/crypto/algapi.c index 5dc9ccdd5a510..206a13f395967 100644 --- a/crypto/algapi.c +++ b/crypto/algapi.c @@ -341,7 +341,7 @@ void crypto_alg_tested(const char *name, int err) q->cra_flags |= CRYPTO_ALG_DEAD; alg = test->adult; - if (list_empty(&alg->cra_list)) + if (crypto_is_dead(alg)) goto complete; if (err == -ECANCELED) -- 2.43.0
