linux-kernel - [PATCH] eCryptfs: Release mutex on hash error path

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Message-ID: <20071102205145.GD30487@localhost.austin.ibm.com>
Date:	Fri, 2 Nov 2007 15:51:46 -0500
From:	Michael Halcrow <mhalcrow@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	phillip@...lewell.homeip.net, ecryptfs-devel@...ts.sourceforge.net,
	Kazuki Ohta <kazuki.ohta@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] eCryptfs: Release mutex on hash error path

On Mon, Oct 29, 2007 at 03:10:09PM +0900, Kazuki Ohta wrote:
> When IS_ERR(desc.tfm) is true, unlocking
> crypt_stat->cs_hash_tfm_mutex is forgotten.

Thanks for reporting this, Kazuki.
---

Release the crypt_stat hash mutex on allocation error. Check for error
conditions when doing crypto hash calls.

Signed-off-by: Michael Halcrow <mhalcrow@...ibm.com>
---
 fs/ecryptfs/crypto.c |   26 ++++++++++++++++++++++----
 1 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index a0f53aa..70f7aab 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -115,11 +115,29 @@ static int ecryptfs_calculate_md5(char *dst,
 		}
 		crypt_stat->hash_tfm = desc.tfm;
 	}
-	crypto_hash_init(&desc);
-	crypto_hash_update(&desc, &sg, len);
-	crypto_hash_final(&desc, dst);
-	mutex_unlock(&crypt_stat->cs_hash_tfm_mutex);
+	rc = crypto_hash_init(&desc);
+	if (rc) {
+		printk(KERN_ERR
+		       "%s: Error initializing crypto hash; rc = [%d]\n",
+		       __FUNCTION__, rc);
+		goto out;
+	}
+	rc = crypto_hash_update(&desc, &sg, len);
+	if (rc) {
+		printk(KERN_ERR
+		       "%s: Error updating crypto hash; rc = [%d]\n",
+		       __FUNCTION__, rc);
+		goto out;
+	}
+	rc = crypto_hash_final(&desc, dst);
+	if (rc) {
+		printk(KERN_ERR
+		       "%s: Error finalizing crypto hash; rc = [%d]\n",
+		       __FUNCTION__, rc);
+		goto out;
+	}
 out:
+	mutex_unlock(&crypt_stat->cs_hash_tfm_mutex);
 	return rc;
 }
 
-- 
1.5.0.6

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