From 57ea34d19963781d05eb12f9b31bd4f70d61ec16 Mon Sep 17 00:00:00 2001 From: Tyler Hicks Date: Sun, 15 Mar 2009 14:17:01 -0500 Subject: eCryptfs: NULL pointer dereference in ecryptfs_send_miscdev() If data is NULL, msg_ctx->msg is set to NULL and then dereferenced afterwards. ecryptfs_send_raw_message() is the only place that ecryptfs_send_miscdev() is called with data being NULL, but the only caller of that function (ecryptfs_process_helo()) is never called. In short, there is currently no way to trigger the NULL pointer dereference. This patch removes the two unused functions and modifies ecryptfs_send_miscdev() to remove the NULL dereferences. Signed-off-by: Tyler Hicks --- fs/ecryptfs/miscdev.c | 28 +++++++++++----------------- 1 file changed, 11 insertions(+), 17 deletions(-) (limited to 'fs/ecryptfs/miscdev.c') diff --git a/fs/ecryptfs/miscdev.c b/fs/ecryptfs/miscdev.c index dda3c58..4ec8f61 100644 --- a/fs/ecryptfs/miscdev.c +++ b/fs/ecryptfs/miscdev.c @@ -193,26 +193,20 @@ int ecryptfs_send_miscdev(char *data, size_t data_size, int rc = 0; mutex_lock(&msg_ctx->mux); - if (data) { - msg_ctx->msg = kmalloc((sizeof(*msg_ctx->msg) + data_size), - GFP_KERNEL); - if (!msg_ctx->msg) { - rc = -ENOMEM; - printk(KERN_ERR "%s: Out of memory whilst attempting " - "to kmalloc(%zd, GFP_KERNEL)\n", __func__, - (sizeof(*msg_ctx->msg) + data_size)); - goto out_unlock; - } - } else - msg_ctx->msg = NULL; + msg_ctx->msg = kmalloc((sizeof(*msg_ctx->msg) + data_size), + GFP_KERNEL); + if (!msg_ctx->msg) { + rc = -ENOMEM; + printk(KERN_ERR "%s: Out of memory whilst attempting " + "to kmalloc(%zd, GFP_KERNEL)\n", __func__, + (sizeof(*msg_ctx->msg) + data_size)); + goto out_unlock; + } msg_ctx->msg->index = msg_ctx->index; msg_ctx->msg->data_len = data_size; msg_ctx->type = msg_type; - if (data) { - memcpy(msg_ctx->msg->data, data, data_size); - msg_ctx->msg_size = (sizeof(*msg_ctx->msg) + data_size); - } else - msg_ctx->msg_size = 0; + memcpy(msg_ctx->msg->data, data, data_size); + msg_ctx->msg_size = (sizeof(*msg_ctx->msg) + data_size); mutex_lock(&daemon->mux); list_add_tail(&msg_ctx->daemon_out_list, &daemon->msg_ctx_out_queue); daemon->num_queued_msg_ctx++; -- cgit v1.1