[PATCH] eCryptfs: Release mutex on hash error path

[Michael Halcrow <mhalcrow@us.ibm.com>]

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@us.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