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linux-sg2042
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hold task_lock around checks in keyctl 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-06-30 11:55:24 +04:00
parent 6120d3dbb1
commit d35abdb288
1 changed files with 2 additions and 0 deletions
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2
security/keys/keyctl.c
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@ -1486,6 +1486,7 @@ long keyctl_session_to_parent(void)
oldwork = NULL; oldwork = NULL;
parent = me->real_parent; parent = me->real_parent;
task_lock(parent);
/* the parent mustn't be init and mustn't be a kernel thread */ /* the parent mustn't be init and mustn't be a kernel thread */
if (parent->pid <= 1 || !parent->mm) if (parent->pid <= 1 || !parent->mm)
goto unlock; goto unlock;
@ -1529,6 +1530,7 @@ long keyctl_session_to_parent(void)
if (!ret) if (!ret)
newwork = NULL; newwork = NULL;
unlock: unlock:
task_unlock(parent);
write_unlock_irq(&tasklist_lock); write_unlock_irq(&tasklist_lock);
rcu_read_unlock(); rcu_read_unlock();
if (oldwork) if (oldwork)