[PATCH 08/10] um: Fix possible race on task->mm

Am 24.03.2012 11:30, schrieb Anton Vorontsov:

Checking for task->mm is dangerous as ->mm might disappear (exit_mm()
assigns NULL under task_lock(), so tasklist lock is not enough).

We can't use get_task_mm()/mmput() pair as mmput() might sleep,
so let's take the task lock while we care about its mm.

Note that we should also use find_lock_task_mm() to check all process'
threads for a valid mm, but for uml we'll do it in a separate patch.

Signed-off-by: Anton Vorontsov <redacted>

Acked-by: Richard Weinberger <richard@nod.at>

Thanks,
//richard

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