3.5.7.5 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Trond Myklebust <[email protected]> commit dee972b967ae111ad5705733de17a3bfc4632311 upstream. Currently, nfs_xdev_mount converts all errors from clone_server() to ENOMEM, which can then leak to userspace (for instance to 'mount'). Fix that. Also ensure that if nfs_fs_mount_common() returns an error, we don't dprintk(0)... The regression originated in commit 3d176e3fe4f6dc379b252bf43e2e146a8f7caf01 (NFS: Use nfs_fs_mount_common() for xdev mounts) Signed-off-by: Trond Myklebust <[email protected]> [ herton: backport for 3.5: * don't change dprintk to print nfs_xdev_mount as we are still in nfs_xdev_mount_common * differing clone_server/nfs_fs_mount_common (function call and arguments), keep the same calls as in 3.5 ] Signed-off-by: Herton Ronaldo Krzesinski <[email protected]> --- fs/nfs/super.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 2292f7e..f3cc9b6 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -2541,7 +2541,6 @@ nfs_xdev_mount_common(struct file_system_type *fs_type, int flags, struct nfs_clone_mount *data = mount_info->cloned; struct nfs_server *server; struct dentry *mntroot = ERR_PTR(-ENOMEM); - int error; dprintk("--> nfs_xdev_mount_common()\n"); @@ -2549,19 +2548,15 @@ nfs_xdev_mount_common(struct file_system_type *fs_type, int flags, /* create a new volume representation */ server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor); - if (IS_ERR(server)) { - error = PTR_ERR(server); - goto out_err; - } + if (IS_ERR(server)) + mntroot = ERR_CAST(server); + else + mntroot = nfs_fs_mount_common(fs_type, server, flags, + dev_name, mount_info); - mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info); - dprintk("<-- nfs_xdev_mount_common() = 0\n"); -out: + dprintk("<-- nfs_xdev_mount_common() = %ld\n", + IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L); return mntroot; - -out_err: - dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error); - goto out; } /* -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
