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| author | Salman Qazi <sqazi@google.com> | 2012-06-25 18:18:15 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-07-05 20:57:32 +0200 |
| commit | 164c33c6adee609b8b9062cce4c10f764d0dce13 (patch) | |
| tree | 47ff40e1ae3d8206dd900e64d757ce16a3ee0774 | |
| parent | 9e85a6f9dc231f3ed3c1dc1b12217505d970142a (diff) | |
| download | linux-164c33c6adee609b8b9062cce4c10f764d0dce13.tar.gz linux-164c33c6adee609b8b9062cce4c10f764d0dce13.tar.bz2 linux-164c33c6adee609b8b9062cce4c10f764d0dce13.zip | |
sched: Fix fork() error path to not crash
In dup_task_struct(), if arch_dup_task_struct() fails, the clean up
code fails to clean up correctly. That's because the clean up
code depends on unininitalized ti->task pointer. We fix this
by making sure that the task and thread_info know about each other
before we attempt to take the error path.
Signed-off-by: Salman Qazi <sqazi@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120626011815.11323.5533.stgit@dungbeetle.mtv.corp.google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | kernel/fork.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index ab5211b9e622..f00e319d8376 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -304,12 +304,17 @@ static struct task_struct *dup_task_struct(struct task_struct *orig) } err = arch_dup_task_struct(tsk, orig); - if (err) - goto out; + /* + * We defer looking at err, because we will need this setup + * for the clean up path to work correctly. + */ tsk->stack = ti; - setup_thread_stack(tsk, orig); + + if (err) + goto out; + clear_user_return_notifier(tsk); clear_tsk_need_resched(tsk); stackend = end_of_stack(tsk); |