linux-kernel - Re: [PATCH] rfc4106, Intel, AES-NI: Don't leak memory in rfc4106_set_hash

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Message-ID: <alpine.LNX.2.00.1102062231530.13593@swampdragon.chaosbits.net>
Date:	Sun, 6 Feb 2011 22:33:31 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	Herbert Xu <herbert@...dor.apana.org.au>
cc:	"Struk, Tadeusz" <tadeusz.struk@...el.com>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"David S. Miller" <davem@...emloft.net>,
	"Huang, Ying" <ying.huang@...el.com>,
	"Hoban, Adrian" <adrian.hoban@...el.com>,
	"Paoloni, Gabriele" <gabriele.paoloni@...el.com>,
	"O Mahony, Aidan" <aidan.o.mahony@...el.com>
Subject: Re: [PATCH] rfc4106, Intel, AES-NI: Don't leak memory in
 rfc4106_set_hash_subkey().

On Mon, 7 Feb 2011, Herbert Xu wrote:

> On Sun, Feb 06, 2011 at 09:34:33PM +0100, Jesper Juhl wrote:
> > On Mon, 7 Feb 2011, Herbert Xu wrote:
> > 
> > > On Sun, Feb 06, 2011 at 08:43:22PM +0100, Jesper Juhl wrote:
> > > > 
> > > > 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.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 aesni-intel_glue.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git 
a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index e013552..4a8c015 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -874,7 +874,7 @@ 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) {
@@ -916,7 +916,6 @@ out_free_request:
 	kfree(req_data);
 out_free_ablkcipher:
 	crypto_free_ablkcipher(ctr_tfm);
-out:
 	return ret;
 }
 
 

-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
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