linux-kernel - [PATCH 5.15 012/135] 9p: fix fid refcount leak in v9fs_vfs_atomic_open

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Date:   Mon, 27 Jun 2022 13:20:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tyler Hicks <tyhicks@...ux.microsoft.com>,
        Christian Schoenebeck <linux_oss@...debyte.com>,
        Dominique Martinet <asmadeus@...ewreck.org>
Subject: [PATCH 5.15 012/135] 9p: fix fid refcount leak in v9fs_vfs_atomic_open_dotl

From: Dominique Martinet <asmadeus@...ewreck.org>

commit beca774fc51a9ba8abbc869cf0c3d965ff17cd24 upstream.

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

This fixes fid leaking with xfstests generic 531

Link: https://lkml.kernel.org/r/20220612085330.1451496-2-asmadeus@codewreck.org
Fixes: 6636b6dcc3db ("9p: add refcount to p9_fid struct")
Cc: stable@...r.kernel.org
Reported-by: Tyler Hicks <tyhicks@...ux.microsoft.com>
Reviewed-by: Tyler Hicks <tyhicks@...ux.microsoft.com>
Reviewed-by: Christian Schoenebeck <linux_oss@...debyte.com>
Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/9p/vfs_inode_dotl.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -276,6 +276,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *
 	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;
 	}
 
@@ -287,6 +288,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *
 	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),
@@ -294,6 +296,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *
 	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);