9p: close ACL leaks

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

fs/9p/acl.c

@@ -185,12 +185,15 @@ int v9fs_acl_chmod(struct dentry *dentry)
 }
 
 int v9fs_set_create_acl(struct dentry *dentry,
-			struct posix_acl *dpacl, struct posix_acl *pacl)
+			struct posix_acl **dpacl, struct posix_acl **pacl)
 {
-	v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, dpacl);
-	v9fs_set_acl(dentry, ACL_TYPE_ACCESS, pacl);
-	posix_acl_release(dpacl);
-	posix_acl_release(pacl);
+	if (dentry) {
+		v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, *dpacl);
+		v9fs_set_acl(dentry, ACL_TYPE_ACCESS, *pacl);
+	}
+	posix_acl_release(*dpacl);
+	posix_acl_release(*pacl);
+	*dpacl = *pacl = NULL;
 	return 0;
 }
 
@@ -212,11 +215,11 @@ int v9fs_acl_mode(struct inode *dir, mode_t *modep,
 		struct posix_acl *clone;
 
 		if (S_ISDIR(mode))
-			*dpacl = acl;
+			*dpacl = posix_acl_dup(acl);
 		clone = posix_acl_clone(acl, GFP_NOFS);
-		retval = -ENOMEM;
+		posix_acl_release(acl);
 		if (!clone)
-			goto cleanup;
+			return -ENOMEM;
 
 		retval = posix_acl_create_masq(clone, &mode);
 		if (retval < 0) {
@@ -225,11 +228,12 @@ int v9fs_acl_mode(struct inode *dir, mode_t *modep,
 		}
 		if (retval > 0)
 			*pacl = clone;
+		else
+			posix_acl_release(clone);
 	}
 	*modep  = mode;
 	return 0;
 cleanup:
-	posix_acl_release(acl);
 	return retval;
 
 }

fs/9p/acl.h

@@ -19,7 +19,7 @@ extern int v9fs_get_acl(struct inode *, struct p9_fid *);
 extern int v9fs_check_acl(struct inode *inode, int mask);
 extern int v9fs_acl_chmod(struct dentry *);
 extern int v9fs_set_create_acl(struct dentry *,
-			       struct posix_acl *, struct posix_acl *);
+			       struct posix_acl **, struct posix_acl **);
 extern int v9fs_acl_mode(struct inode *dir, mode_t *modep,
 			 struct posix_acl **dpacl, struct posix_acl **pacl);
 #else
@@ -33,8 +33,8 @@ static inline int v9fs_acl_chmod(struct dentry *dentry)
 	return 0;
 }
 static inline int v9fs_set_create_acl(struct dentry *dentry,
-				      struct posix_acl *dpacl,
-				      struct posix_acl *pacl)
+				      struct posix_acl **dpacl,
+				      struct posix_acl **pacl)
 {
 	return 0;
 }

fs/9p/vfs_inode_dotl.c

@@ -242,7 +242,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
 		goto error;
 
 	/* Now set the ACL based on the default value */
-	v9fs_set_create_acl(dentry, dacl, pacl);
+	v9fs_set_create_acl(dentry, &dacl, &pacl);
 
 	v9inode = V9FS_I(inode);
 	mutex_lock(&v9inode->v_mutex);
@@ -283,6 +283,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
 err_clunk_old_fid:
 	if (ofid)
 		p9_client_clunk(ofid);
+	v9fs_set_create_acl(NULL, &dacl, &pacl);
 	return err;
 }
 
@@ -376,12 +377,13 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 		d_instantiate(dentry, inode);
 	}
 	/* Now set the ACL based on the default value */
-	v9fs_set_create_acl(dentry, dacl, pacl);
+	v9fs_set_create_acl(dentry, &dacl, &pacl);
 	inc_nlink(dir);
 	v9fs_invalidate_inode_attr(dir);
 error:
 	if (fid)
 		p9_client_clunk(fid);
+	v9fs_set_create_acl(NULL, &dacl, &pacl);
 	return err;
 }
 
@@ -781,10 +783,11 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
 		d_instantiate(dentry, inode);
 	}
 	/* Now set the ACL based on the default value */
-	v9fs_set_create_acl(dentry, dacl, pacl);
+	v9fs_set_create_acl(dentry, &dacl, &pacl);
 error:
 	if (fid)
 		p9_client_clunk(fid);
+	v9fs_set_create_acl(NULL, &dacl, &pacl);
 	return err;
 }