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Message-ID: <20120626011815.11323.5533.stgit@dungbeetle.mtv.corp.google.com> Date: Mon, 25 Jun 2012 18:18:15 -0700 From: Salman Qazi <sqazi@...gle.com> To: a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org Subject: [PATCH] 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@...gle.com> --- kernel/fork.c | 11 ++++++++--- 1 files changed, 8 insertions(+), 3 deletions(-) diff --git a/kernel/fork.c b/kernel/fork.c index ab5211b..f00e319 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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