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sys_getppid: add missing rcu_dereference

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In order to safely dereference current->real_parent inside an
rcu_read_lock, we need an rcu_dereference.

Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mandeep Singh Baines 2011-12-08 14:34:44 -08:00 committed by Linus Torvalds
parent 1cee22b7f3
commit 031af165b1
1 changed files with 1 additions and 1 deletions
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2
kernel/timer.c
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@ -1368,7 +1368,7 @@ SYSCALL_DEFINE0(getppid)
int pid;
rcu_read_lock();
pid = task_tgid_vnr(current->real_parent);
pid = task_tgid_vnr(rcu_dereference(current->real_parent));
rcu_read_unlock();
return pid;