linux-kernel - [PATCH 01/06] 9p: fix fid refcount leak in v9fs_vfs_atomic_open

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Date:   Sun, 12 Jun 2022 17:53:24 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Christian Schoenebeck <linux_oss@...debyte.com>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Jianyong Wu <jianyong.wu@....com>
Cc:     v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH 01/06] 9p: fix fid refcount leak in v9fs_vfs_atomic_open_dotl

We need to release directory fid if we fail halfway through open

This fixes fid leaking with xfstests generic 531

Fixes: 6636b6dcc3db ("9p: add refcount to p9_fid struct")
Cc: stable@...r.kernel.org
Reported-by: Tyler Hicks <tyhicks@...ux.microsoft.com>
Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
---
 fs/9p/vfs_inode_dotl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index d17502a738a9..b6eb1160296c 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -274,6 +274,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 	if (IS_ERR(ofid)) {
 		err = PTR_ERR(ofid);
 		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
+		p9_client_clunk(dfid);
 		goto out;
 	}
 
@@ -285,6 +286,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 	if (err) {
 		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
 			 err);
+		p9_client_clunk(dfid);
 		goto error;
 	}
 	err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
@@ -292,6 +294,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 	if (err < 0) {
 		p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
 			 err);
+		p9_client_clunk(dfid);
 		goto error;
 	}
 	v9fs_invalidate_inode_attr(dir);
-- 
2.35.1