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-rw-r--r--kernel/fork.c20
1 files changed, 14 insertions, 6 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index c08cf05dd59..208dd99f13b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1606,7 +1606,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL;
struct files_struct *fd, *new_fd = NULL;
struct sem_undo_list *new_ulist = NULL;
- struct nsproxy *new_nsproxy, *old_nsproxy;
+ struct nsproxy *new_nsproxy = NULL, *old_nsproxy = NULL;
struct uts_namespace *uts, *new_uts = NULL;
check_unshare_flags(&unshare_flags);
@@ -1634,18 +1634,24 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
if ((err = unshare_utsname(unshare_flags, &new_uts)))
goto bad_unshare_cleanup_semundo;
- if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist ||
- new_uts) {
-
+ if (new_ns || new_uts) {
old_nsproxy = current->nsproxy;
new_nsproxy = dup_namespaces(old_nsproxy);
if (!new_nsproxy) {
err = -ENOMEM;
goto bad_unshare_cleanup_uts;
}
+ }
+
+ if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist ||
+ new_uts) {
task_lock(current);
- current->nsproxy = new_nsproxy;
+
+ if (new_nsproxy) {
+ current->nsproxy = new_nsproxy;
+ new_nsproxy = old_nsproxy;
+ }
if (new_fs) {
fs = current->fs;
@@ -1687,9 +1693,11 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
}
task_unlock(current);
- put_nsproxy(old_nsproxy);
}
+ if (new_nsproxy)
+ put_nsproxy(new_nsproxy);
+
bad_unshare_cleanup_uts:
if (new_uts)
put_uts_ns(new_uts);