9p: fix fid refcount leak in v9fs_vfs_atomic_open_dotl

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@vger.kernel.org
Reported-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index a61df2e0ae52134a3e9364d08dbe218359e6738c..833c638437a7287a3bb9b7796c677f89c97be297 100644 (file)
--- 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 *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;
        }
 
@@ -287,6 +288,7 @@ 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),
@@ -294,6 +296,7 @@ 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);