linux-kernel - [PATCH v2 4/4] crypto: Documentation: fix none signal safe sample

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Date:   Thu, 18 May 2017 16:29:26 +0300
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>,
        David Howells <dhowells@...hat.com>
Cc:     Ofir Drang <ofir.drang@....com>, linux-crypto@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        keyrings@...r.kernel.org
Subject: [PATCH v2 4/4] crypto: Documentation: fix none signal safe sample

The sample code was showing use of wait_for_completion_interruptible()
for waiting for an async. crypto op to finish. However, if a signal
arrived it would free the buffers used even while crypto HW might
still DMA from/into the buffers.

Resolve this by using wait_for_completion() instead.

Reported-by: Eric Biggers <ebiggers3@...il.com>
Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
---
 Documentation/crypto/api-samples.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/crypto/api-samples.rst b/Documentation/crypto/api-samples.rst
index d021fd9..944f08b 100644
--- a/Documentation/crypto/api-samples.rst
+++ b/Documentation/crypto/api-samples.rst
@@ -48,7 +48,7 @@ Code Example For Symmetric Key Cipher Operation
             break;
         case -EINPROGRESS:
         case -EBUSY:
-            rc = wait_for_completion_interruptible(
+            rc = wait_for_completion(
                 &sk->result.completion);
             if (!rc && !sk->result.err) {
                 reinit_completion(&sk->result.completion);
-- 
2.1.4