[PATCH] ptrace: ptrace_attach: fix the usage of ->cred_exec_mutex

[Oleg Nesterov <oleg@redhat.com>]

ptrace_attach() needs task->cred_exec_mutex, not current->cred_exec_mutex.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>

--- PTRACE/kernel/ptrace.c~	2009-04-15 12:53:58.000000000 +0200
+++ PTRACE/kernel/ptrace.c	2009-04-27 01:22:51.000000000 +0200
@@ -188,7 +188,7 @@ int ptrace_attach(struct task_struct *ta
 	/* Protect exec's credential calculations against our interference;
 	 * SUID, SGID and LSM creds get determined differently under ptrace.
 	 */
-	retval = mutex_lock_interruptible(&current->cred_exec_mutex);
+	retval = mutex_lock_interruptible(&task->cred_exec_mutex);
 	if (retval  < 0)
 		goto out;
 
@@ -232,7 +232,7 @@ repeat:
 bad:
 	write_unlock_irqrestore(&tasklist_lock, flags);
 	task_unlock(task);
-	mutex_unlock(&current->cred_exec_mutex);
+	mutex_unlock(&task->cred_exec_mutex);
 out:
 	return retval;
 }