Re: [PATCH] rfc4106, Intel, AES-NI: Don't leak memory in rfc4106_set_hash_subkey().

From: 
Date: Sun, 16 Jan 2011 16:41:11 +0000
Subject: RE: [PATCH] rfc4106, Intel, AES-NI: Don't leak memory in rfc4106_set_hash_subkey().

Hi Jesper,
Thanks, but I think there is still a problem here. You don't want to kfree req_data
when the kmalloc failed. I think it should look as follows.  
Are you ok with this?

On Mon, 7 Feb 2011, Herbert Xu wrote:

On Sun, Feb 06, 2011 at 09:34:33PM +0100, Jesper Juhl wrote:

quoted

On Mon, 7 Feb 2011, Herbert Xu wrote:

quoted

On Sun, Feb 06, 2011 at 08:43:22PM +0100, Jesper Juhl wrote:

quoted

Herbert: If Tadeusz agrees, could you please replace the patch
you merged 
with the one above?

Please send an incremental patch.

Sure thing. What would you like it based on exactly?

The current cryptodev-2.6 tree should do.

Here goes.

Fix up previous patch that attempted to fix a mem leak in 
rfc4106_set_hash_subkey. The previous patch was flawed in that the 'goto 
out' would still leak.

---
 arch/x86/crypto/aesni-intel_glue.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index e013552..c9f0227 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c

@@ -874,11 +874,11 @@ rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len)
 
 	ret = crypto_ablkcipher_setkey(ctr_tfm, key, key_len);
 	if (ret)
-		goto out;
+		goto out_free_ablkcipher;
 
 	req = ablkcipher_request_alloc(ctr_tfm, GFP_KERNEL);
 	if (!req) {
-		ret = -EINVAL;
+		ret = -ENOMEM;
 		goto out_free_ablkcipher;
 	}
 

@@ -911,12 +911,11 @@ rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len)
 		if (!ret)
 			ret = req_data->result.err;
 	}
+	kfree(req_data);
 out_free_request:
 	ablkcipher_request_free(req);
-	kfree(req_data);
 out_free_ablkcipher:
 	crypto_free_ablkcipher(ctr_tfm);
-out:
 	return ret;
 }
 

-- 
1.7.4

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