linux-kernel - Re: [PATCH 2.6.26-rc3] xfrm: Installing NULL encryption IPSec SAs fails

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Message-Id: <20080521.172341.95895019.davem@davemloft.net>
Date:	Wed, 21 May 2008 17:23:41 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	martin@...ongswan.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.26-rc3] xfrm: Installing NULL encryption IPSec SAs
 fails

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Thu, 22 May 2008 07:59:22 +0800

> I think we should get rid of the zero check altogether as a
> zero-length key will fail on setkey of a real algorithm anyway
> because of the min_keysize/max_keysize checks in the crypto API.

Ok, how does this look?

xfrm_user: Remove zero length key checks.

The crypto layer will determine whether that is valid
or not.

Suggested by Herbert Xu, based upon a report and patch
by Martin Willi.

Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index a1b0fbe..b976d9e 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -50,19 +50,8 @@ static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
 
 	switch (type) {
 	case XFRMA_ALG_AUTH:
-		if (!algp->alg_key_len &&
-		    strcmp(algp->alg_name, "digest_null") != 0)
-			return -EINVAL;
-		break;
-
 	case XFRMA_ALG_CRYPT:
-		if (!algp->alg_key_len &&
-		    strcmp(algp->alg_name, "cipher_null") != 0)
-			return -EINVAL;
-		break;
-
 	case XFRMA_ALG_COMP:
-		/* Zero length keys are legal.  */
 		break;
 
 	default:
--
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