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crypto: ccree - don't attempt 0 len DMA mappings
Refuse to try mapping zero bytes as this may cause a fault
on some configurations / platforms and it seems the prev.
attempt is not enough and we need to be more explicit.
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Reported-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Fixes: ce0fc6db38
("crypto: ccree - protect against empty or NULL
scatterlists")
Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -258,6 +258,13 @@ static int cc_map_sg(struct device *dev, struct scatterlist *sg,
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{
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int ret = 0;
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if (!nbytes) {
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*mapped_nents = 0;
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*lbytes = 0;
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*nents = 0;
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return 0;
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}
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*nents = cc_get_sgl_nents(dev, sg, nbytes, lbytes);
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if (*nents > max_sg_nents) {
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*nents = 0;
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