[PATCH 6.7 040/162] tls: decrement decrypt_pending if no async completion will be called

Greg Kroah-Hartman
2024-03-04T21:28:42Z

From: Sabrina Dubroca <sd@queasysnail.net>

[ Upstream commit f7fa16d49837f947ee59492958f9e6f0e51d9a78 ]

With mixed sync/async decryption, or failures of crypto_aead_decrypt,
we increment decrypt_pending but we never do the corresponding
decrement since tls_decrypt_done will not be called. In this case, we
should decrement decrypt_pending immediately to avoid getting stuck.

For example, the prequeue prequeue test gets stuck with mixed
modes (one async decrypt + one sync decrypt).

Fixes: 94524d8fc965 ("net/tls: Add support for async decryption of tls records")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/r/c56d5fc35543891d5319f834f25622360e1bfbec.1709132643.git.sd@queasysnail.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/tls/tls_sw.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index de96959336c48..9f23ba321efe6 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -289,6 +289,8 @@ static int tls_do_decryption(struct sock *sk,
return 0;

ret = crypto_wait_req(ret, &ctx->async_wait);
+ } else if (darg->async) {
+ atomic_dec(&ctx->decrypt_pending);
}
darg->async = false;

--
2.43.0