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authorHoria Geantă <horia.geanta@nxp.com>2019-06-10 15:30:58 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2019-06-20 08:18:33 +0200
commit059d73eea6409873446a858dd64a5bec9bf68b70 (patch)
tree64bcd3c478e63f213731115d7f132d9e42cd0a0b /lib/crc7.c
parenthwrng: iproc-rng200 - Add support for 7211 (diff)
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crypto: caam - use len instead of nents for bulding HW S/G table
Currently, conversion of SW S/G table into HW S/G layout relies on nents returned by sg_nents_for_len(sg, len). However this leaves the possibility of HW S/G referencing more data then needed: since buffer length in HW S/G entries is filled using sg_dma_len(sg), the last entry in HW S/G table might have a length that is bigger than needed for the crypto request. This way of S/G table conversion is fine, unless after converting a table more entries have to be appended to the HW S/G table. In this case, crypto engine would access data from the S/G entry having the incorrect length, instead of advancing in the S/G table. This situation doesn't exist, but the upcoming implementation of IV update for skcipher algorithms needs to add a S/G entry after req->dst S/G (corresponding to output IV). Signed-off-by: Horia Geantă <horia.geanta@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'lib/crc7.c')
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