4 files changed, 13 insertions, 41 deletions

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index cd62d75..e2832bc 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1906,9 +1906,9 @@ int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
 			goto out;
 		}
 	}
-	mutex_unlock(&key_tfm_list_mutex);
 	(*tfm) = key_tfm->key_tfm;
 	(*tfm_mutex) = &key_tfm->key_tfm_mutex;
 out:
+	mutex_unlock(&key_tfm_list_mutex);
 	return rc;
 }
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 951ee33..c15c257 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -660,8 +660,6 @@ int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
 int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 				      struct ecryptfs_auth_tok **auth_tok,
 				      char *sig);
-int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start,
-			 int num_zeros);
 int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
 			 loff_t offset, size_t size);
 int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
diff --git a/fs/ecryptfs/miscdev.c b/fs/ecryptfs/miscdev.c
index 6560da1..09a4522 100644
--- a/fs/ecryptfs/miscdev.c
+++ b/fs/ecryptfs/miscdev.c
@@ -243,7 +243,6 @@ ecryptfs_miscdev_read(struct file *file, char __user *buf, size_t count,
 	struct ecryptfs_daemon *daemon;
 	struct ecryptfs_msg_ctx *msg_ctx;
 	size_t packet_length_size;
-	u32 counter_nbo;
 	char packet_length[3];
 	size_t i;
 	size_t total_length;
@@ -328,20 +327,18 @@ check_list:
 		       "pending message\n", __func__, count, total_length);
 		goto out_unlock_msg_ctx;
 	}
-	i = 0;
-	buf[i++] = msg_ctx->type;
-	counter_nbo = cpu_to_be32(msg_ctx->counter);
-	memcpy(&buf[i], (char *)&counter_nbo, 4);
-	i += 4;
+	rc = -EFAULT;
+	if (put_user(msg_ctx->type, buf))
+		goto out_unlock_msg_ctx;
+	if (put_user(cpu_to_be32(msg_ctx->counter), (__be32 __user *)(buf + 1)))
+		goto out_unlock_msg_ctx;
+	i = 5;
 	if (msg_ctx->msg) {
-		memcpy(&buf[i], packet_length, packet_length_size);
+		if (copy_to_user(&buf[i], packet_length, packet_length_size))
+			goto out_unlock_msg_ctx;
 		i += packet_length_size;
-		rc = copy_to_user(&buf[i], msg_ctx->msg, msg_ctx->msg_size);
-		if (rc) {
-			printk(KERN_ERR "%s: copy_to_user returned error "
-			       "[%d]\n", __func__, rc);
+		if (copy_to_user(&buf[i], msg_ctx->msg, msg_ctx->msg_size))
 			goto out_unlock_msg_ctx;
-		}
 		i += msg_ctx->msg_size;
 	}
 	rc = i;
@@ -452,7 +449,8 @@ static ssize_t
 ecryptfs_miscdev_write(struct file *file, const char __user *buf,
 		       size_t count, loff_t *ppos)
 {
-	u32 counter_nbo, seq;
+	__be32 counter_nbo;
+	u32 seq;
 	size_t packet_size, packet_size_length, i;
 	ssize_t sz = 0;
 	char *data;
@@ -485,7 +483,7 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
 			       count);
 			goto out_free;
 		}
-		memcpy((char *)&counter_nbo, &data[i], 4);
+		memcpy(&counter_nbo, &data[i], 4);
 		seq = be32_to_cpu(counter_nbo);
 		i += 4;
 		rc = ecryptfs_parse_packet_length(&data[i], &packet_size,
@@ -577,13 +575,11 @@ int ecryptfs_init_ecryptfs_miscdev(void)
 	int rc;
 
 	atomic_set(&ecryptfs_num_miscdev_opens, 0);
-	mutex_lock(&ecryptfs_daemon_hash_mux);
 	rc = misc_register(&ecryptfs_miscdev);
 	if (rc)
 		printk(KERN_ERR "%s: Failed to register miscellaneous device "
 		       "for communications with userspace daemons; rc = [%d]\n",
 		       __func__, rc);
-	mutex_unlock(&ecryptfs_daemon_hash_mux);
 	return rc;
 }
 
diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index ebf5515..75c2ea9 100644
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -157,20 +157,6 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
 			       ecryptfs_page_idx, rc);
 			goto out;
 		}
-		if (start_offset_in_page) {
-			/* Read in the page from the lower
-			 * into the eCryptfs inode page cache,
-			 * decrypting */
-			rc = ecryptfs_decrypt_page(ecryptfs_page);
-			if (rc) {
-				printk(KERN_ERR "%s: Error decrypting "
-				       "page; rc = [%d]\n",
-				       __func__, rc);
-				ClearPageUptodate(ecryptfs_page);
-				page_cache_release(ecryptfs_page);
-				goto out;
-			}
-		}
 		ecryptfs_page_virt = kmap_atomic(ecryptfs_page, KM_USER0);
 
 		/*
@@ -349,14 +335,6 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
 			       ecryptfs_page_idx, rc);
 			goto out;
 		}
-		rc = ecryptfs_decrypt_page(ecryptfs_page);
-		if (rc) {
-			printk(KERN_ERR "%s: Error decrypting "
-			       "page; rc = [%d]\n", __func__, rc);
-			ClearPageUptodate(ecryptfs_page);
-			page_cache_release(ecryptfs_page);
-			goto out;
-		}
 		ecryptfs_page_virt = kmap_atomic(ecryptfs_page, KM_USER0);
 		memcpy((data + data_offset),
 		       ((char *)ecryptfs_page_virt + start_offset_in_page),