[PATCH 4.19 07/97] ecryptfs: fix a memory leak bug in ecryptfs_init_messaging()

[Greg Kroah-Hartman]

From: Wenwen Wang <wenwen@xxxxxxxxxx>

commit b4a81b87a4cfe2bb26a4a943b748d96a43ef20e8 upstream.

In ecryptfs_init_messaging(), if the allocation for 'ecryptfs_msg_ctx_arr'
fails, the previously allocated 'ecryptfs_daemon_hash' is not deallocated,
leading to a memory leak bug. To fix this issue, free
'ecryptfs_daemon_hash' before returning the error.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 88b4a07e6610 ("[PATCH] eCryptfs: Public key transport mechanism")
Signed-off-by: Wenwen Wang <wenwen@xxxxxxxxxx>
Signed-off-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/ecryptfs/messaging.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/ecryptfs/messaging.c
+++ b/fs/ecryptfs/messaging.c
@@ -392,6 +392,7 @@ int __init ecryptfs_init_messaging(void)
 					* ecryptfs_message_buf_len),
 				       GFP_KERNEL);
 	if (!ecryptfs_msg_ctx_arr) {
+		kfree(ecryptfs_daemon_hash);
 		rc = -ENOMEM;
 		goto out;
 	}