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[CRYPTO] scatterwalk: Handle zero nbytes in scatterwalk_map_and_copy
It's better to return silently than crash and burn when someone feeds us a zero length. In particular the null digest algorithm when used as part of authenc will do that to us. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -105,6 +105,9 @@ void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
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struct scatter_walk walk;
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unsigned int offset = 0;
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if (!nbytes)
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return;
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for (;;) {
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scatterwalk_start(&walk, sg);
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