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relay: check array offset before using it
Smatch complains that we started using the array offset before we
checked that it was valid.
Fixes: 017c59c042
('relay: Use per CPU constructs for the relay channel buffer pointers')
Link: http://lkml.kernel.org/r/20161013084947.GC16198@mwanda
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -809,11 +809,11 @@ void relay_subbufs_consumed(struct rchan *chan,
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{
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struct rchan_buf *buf;
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if (!chan)
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if (!chan || cpu >= NR_CPUS)
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return;
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buf = *per_cpu_ptr(chan->buf, cpu);
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if (cpu >= NR_CPUS || !buf || subbufs_consumed > chan->n_subbufs)
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if (!buf || subbufs_consumed > chan->n_subbufs)
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return;
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if (subbufs_consumed > buf->subbufs_produced - buf->subbufs_consumed)
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