diff options
| author |   Antoine Ténart <antoine.tenart@free-electrons.com> | 2017-12-26 17:21:17 +0100 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2018-01-05 18:43:06 +1100 |
| commit | 809778e02cd45d0625439fee67688f655627bb3c (patch) | |
| tree | 9b6ac57c9b59da9ba0572c803d89480c936ab2d6 /drivers/crypto | |
| parent | crypto: inside-secure - avoid unmapping DMA memory that was not mapped (diff) | |
| download | linux-dev-809778e02cd45d0625439fee67688f655627bb3c.tar.xz linux-dev-809778e02cd45d0625439fee67688f655627bb3c.zip | |
crypto: inside-secure - fix hash when length is a multiple of a block
This patch fixes the hash support in the SafeXcel driver when the update
size is a multiple of a block size, and when a final call is made just
after with a size of 0. In such cases the driver should cache the last
block from the update to avoid handling 0 length data on the final call
(that's a hardware limitation).
Cc: stable@vger.kernel.org
Fixes: 1b44c5a60c13 ("crypto: inside-secure - add SafeXcel EIP197 crypto engine driver")
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/inside-secure/safexcel_hash.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/drivers/crypto/inside-secure/safexcel_hash.c b/drivers/crypto/inside-secure/safexcel_hash.c index fbc03d6e7db7..122a2a58e98f 100644 --- a/drivers/crypto/inside-secure/safexcel_hash.c +++ b/drivers/crypto/inside-secure/safexcel_hash.c @@ -189,17 +189,31 @@ static int safexcel_ahash_send_req(struct crypto_async_request *async, int ring, else cache_len = queued - areq->nbytes; - /* - * If this is not the last request and the queued data does not fit - * into full blocks, cache it for the next send() call. - */ - extra = queued & (crypto_ahash_blocksize(ahash) - 1); - if (!req->last_req && extra) { - sg_pcopy_to_buffer(areq->src, sg_nents(areq->src), - req->cache_next, extra, areq->nbytes - extra); + if (!req->last_req) { + /* If this is not the last request and the queued data does not + * fit into full blocks, cache it for the next send() call. + */ + extra = queued & (crypto_ahash_blocksize(ahash) - 1); + if (!extra) + /* If this is not the last request and the queued data + * is a multiple of a block, cache the last one for now. + */ + extra = queued - crypto_ahash_blocksize(ahash); - queued -= extra; - len -= extra; + if (extra) { + sg_pcopy_to_buffer(areq->src, sg_nents(areq->src), + req->cache_next, extra, + areq->nbytes - extra); + + queued -= extra; + len -= extra; + + if (!queued) { + *commands = 0; + *results = 0; + return 0; + } + } } spin_lock_bh(&priv->ring[ring].egress_lock); |