This is a note to let you know that I've just added the patch titled

crypto: inside-secure - fix hash when length is a multiple of a block

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: crypto-inside-secure-fix-hash-when-length-is-a-multiple-of-a-block.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 809778e02cd45d0625439fee67688f655627bb3c Mon Sep 17 00:00:00 2001

From: =?UTF-8?q?Antoine=20T=C3=A9nart?= antoine.tenart@free-electrons.com Date: Tue, 26 Dec 2017 17:21:17 +0100 Subject: crypto: inside-secure - fix hash when length is a multiple of a block

From: Antoine Tenart antoine.tenart@free-electrons.com

commit 809778e02cd45d0625439fee67688f655627bb3c upstream.

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).

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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/crypto/inside-secure/safexcel_hash.c | 34 +++++++++++++++++++-------- 1 file changed, 24 insertions(+), 10 deletions(-)

--- a/drivers/crypto/inside-secure/safexcel_hash.c +++ b/drivers/crypto/inside-secure/safexcel_hash.c @@ -186,17 +186,31 @@ static int safexcel_ahash_send_req(struc 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);

Patches currently in stable-queue which might be from antoine.tenart@free-electrons.com are

queue-4.15/crypto-inside-secure-avoid-unmapping-dma-memory-that-was-not-mapped.patch queue-4.15/crypto-inside-secure-fix-hash-when-length-is-a-multiple-of-a-block.patch