PATCH -mm] fix create_new_namespaces() return value

[Cedric Le Goater <clg@fr.ibm.com>]

The following patch modifies create_new_namespaces() to also use the 
errors returned by the copy_*_ns routines and not to systematically 
return ENOMEM.

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Pavel Emelianov <xemul@openvz.org>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Eric W. Biederman <ebiederm@xmission.com>
---
 kernel/nsproxy.c |   23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

Index: 2.6.22-rc4-mm2/kernel/nsproxy.c
===================================================================
--- 2.6.22-rc4-mm2.orig/kernel/nsproxy.c
+++ 2.6.22-rc4-mm2/kernel/nsproxy.c
@@ -58,30 +58,41 @@ static struct nsproxy *create_new_namesp
 			struct fs_struct *new_fs)
 {
 	struct nsproxy *new_nsp;
+	int err;
 
 	new_nsp = clone_nsproxy(tsk->nsproxy);
 	if (!new_nsp)
 		return ERR_PTR(-ENOMEM);
 
 	new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs);
-	if (IS_ERR(new_nsp->mnt_ns))
+	if (IS_ERR(new_nsp->mnt_ns)) {
+		err = PTR_ERR(new_nsp->mnt_ns);
 		goto out_ns;
+	}
 
 	new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns);
-	if (IS_ERR(new_nsp->uts_ns))
+	if (IS_ERR(new_nsp->uts_ns)) {
+		err = PTR_ERR(new_nsp->uts_ns);
 		goto out_uts;
+	}
 
 	new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns);
-	if (IS_ERR(new_nsp->ipc_ns))
+	if (IS_ERR(new_nsp->ipc_ns)) {
+		err = PTR_ERR(new_nsp->ipc_ns);
 		goto out_ipc;
+	}
 
 	new_nsp->pid_ns = copy_pid_ns(flags, tsk->nsproxy->pid_ns);
-	if (IS_ERR(new_nsp->pid_ns))
+	if (IS_ERR(new_nsp->pid_ns)) {
+		err = PTR_ERR(new_nsp->pid_ns);
 		goto out_pid;
+	}
 
 	new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns);
-	if (IS_ERR(new_nsp->user_ns))
+	if (IS_ERR(new_nsp->user_ns)) {
+		err = PTR_ERR(new_nsp->user_ns);
 		goto out_user;
+	}
 
 	return new_nsp;
 
@@ -99,7 +110,7 @@ out_uts:
 		put_mnt_ns(new_nsp->mnt_ns);
 out_ns:
 	kfree(new_nsp);
-	return ERR_PTR(-ENOMEM);
+	return ERR_PTR(err);
 }
 
 /*