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arm64: csum: Fix pathological zero-length calls
In validating the checksumming results of the new routine, I sadly neglected to test its not-checksumming results. Thus it slipped through that the one case where @buff is already dword-aligned and @len = 0 manages to defeat the tail-masking logic and behave as if @len = 8. For a zero length it doesn't make much sense to deference @buff anyway, so just add an early return (which has essentially zero impact on performance). Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
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@ -20,6 +20,9 @@ unsigned int do_csum(const unsigned char *buff, int len)
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const u64 *ptr;
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u64 data, sum64 = 0;
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if (unlikely(len == 0))
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return 0;
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offset = (unsigned long)buff & 7;
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/*
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* This is to all intents and purposes safe, since rounding down cannot
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