tracing/rb: Init the CPU mask on allocation
Before commitb32614c034
("tracing/rb: Convert to hotplug state machine") the allocated cpumask was initialized to the mask of online or possible CPUs. After the CPU hotplug changes the buffer initialization moved to trace_rb_cpu_prepare() but the cpumask is allocated with alloc_cpumask() and therefor has random content. As a consequence the cpu buffers are not initialized and a later access dereferences a NULL pointer. Use zalloc_cpumask() instead so trace_rb_cpu_prepare() initializes the buffers properly. Fixes:b32614c034
("tracing/rb: Convert to hotplug state machine") Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: rostedt@goodmis.org Link: http://lkml.kernel.org/r/20161207133133.hzkcqfllxcdi3joz@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -1297,7 +1297,7 @@ struct ring_buffer *__ring_buffer_alloc(unsigned long size, unsigned flags,
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if (!buffer)
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return NULL;
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if (!alloc_cpumask_var(&buffer->cpumask, GFP_KERNEL))
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if (!zalloc_cpumask_var(&buffer->cpumask, GFP_KERNEL))
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goto fail_free_buffer;
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nr_pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
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