sanitize audit_mq_open()

* don't bother with allocations
* don't do double copy_from_user()
* don't duplicate parts of check for audit_dummy_context()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 11 insertions, 12 deletions

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 192da806c28..d448b69672b 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -588,22 +588,18 @@ static int mq_attr_ok(struct mq_attr *attr)
  * Invoked when creating a new queue via sys_mq_open
  */
 static struct file *do_create(struct dentry *dir, struct dentry *dentry,
-                        int oflag, mode_t mode, struct mq_attr __user *u_attr)
+                        int oflag, mode_t mode, struct mq_attr *attr)
 {
         const struct cred *cred = current_cred();
-        struct mq_attr attr;
         struct file *result;
         int ret;
 
-        if (u_attr) {
-                ret = -EFAULT;
-                if (copy_from_user(&attr, u_attr, sizeof(attr)))
-                        goto out;
+        if (attr) {
                 ret = -EINVAL;
-                if (!mq_attr_ok(&attr))
+                if (!mq_attr_ok(attr))
                         goto out;
                 /* store for use during create */
-                dentry->d_fsdata = &attr;
+                dentry->d_fsdata = attr;
         }
 
         mode &= ~current->fs->umask;
@@ -660,11 +656,13 @@ asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
         struct dentry *dentry;
         struct file *filp;
         char *name;
+        struct mq_attr attr;
         int fd, error;
 
-        error = audit_mq_open(oflag, mode, u_attr);
-        if (error != 0)
-                return error;
+        if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr)))
+                return -EFAULT;
+
+        audit_mq_open(oflag, mode, u_attr ? &attr : NULL);
 
         if (IS_ERR(name = getname(u_name)))
                 return PTR_ERR(name);
@@ -690,7 +688,8 @@ asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
                         filp = do_open(dentry, oflag);
                 } else {
                         filp = do_create(mqueue_mnt->mnt_root, dentry,
-                                                oflag, mode, u_attr);
+                                                oflag, mode,
+                                                u_attr ? &attr : NULL);
                 }
         } else {
                 error = -ENOENT;