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crypto: api - Fix liveliness check in crypto_alg_tested

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[ Upstream commit b81e286ba1 ]

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@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Herbert Xu 2024-10-06 09:18:37 +08:00 committed by Greg Kroah-Hartman
parent 911c9bc048
commit 1bc59a7c07
1 changed files with 1 additions and 1 deletions
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2
crypto/algapi.c
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@ -341,7 +341,7 @@ found:
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)