[PATCH] cpuset: unsafe mm reference fix
Fix unsafe reference to a tasks mm struct, by moving the reference inside of a convenient nearby properly guarded code block. Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -1183,11 +1183,11 @@ static int attach_task(struct cpuset *cs, char *pidbuf, char **ppathbuf)
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mm = get_task_mm(tsk);
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mm = get_task_mm(tsk);
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if (mm) {
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if (mm) {
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mpol_rebind_mm(mm, &to);
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mpol_rebind_mm(mm, &to);
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if (is_memory_migrate(cs))
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do_migrate_pages(mm, &from, &to, MPOL_MF_MOVE_ALL);
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mmput(mm);
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mmput(mm);
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}
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}
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if (is_memory_migrate(cs))
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do_migrate_pages(tsk->mm, &from, &to, MPOL_MF_MOVE_ALL);
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put_task_struct(tsk);
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put_task_struct(tsk);
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synchronize_rcu();
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synchronize_rcu();
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if (atomic_dec_and_test(&oldcs->count))
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if (atomic_dec_and_test(&oldcs->count))
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