Patch "crypto: nx - Fixing NX data alignment with nx_sg list" has been added to the 4.1-stable tree

[<gregkh@linuxfoundation.org>]

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

    crypto: nx - Fixing NX data alignment with nx_sg list

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     crypto-nx-fixing-nx-data-alignment-with-nx_sg-list.patch
and it can be found in the queue-4.1 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 c3365ce130e50176533debe1cabebcdb8e61156c Mon Sep 17 00:00:00 2001
From: Leonidas Da Silva Barbosa <leosilva@linux.vnet.ibm.com>
Date: Thu, 23 Apr 2015 17:40:30 -0300
Subject: crypto: nx - Fixing NX data alignment with nx_sg list

From: Leonidas Da Silva Barbosa <leosilva@linux.vnet.ibm.com>

commit c3365ce130e50176533debe1cabebcdb8e61156c upstream.

In NX we need to pass always a 16 multiple size nx_sg_list to
co processor. Trim function handle with this assuring all nx_sg_lists
are 16 multiple size, although data was not being considerated when
crop was done. It was causing an unalignment between size of the list
and data, corrupting csbcpb fields returning a -23 H_ST_PARM error, or
invalid operation.

This patch fix this recalculating how much data should be put back
in to_process variable what assures the size of sg_list will be
correct with size of the data.

Signed-off-by: Leonidas S. Barbosa <leosilva@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/crypto/nx/nx.c |   28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

--- a/drivers/crypto/nx/nx.c
+++ b/drivers/crypto/nx/nx.c
@@ -215,8 +215,15 @@ struct nx_sg *nx_walk_and_build(struct n
  * @delta:  is the amount we need to crop in order to bound the list.
  *
  */
-static long int trim_sg_list(struct nx_sg *sg, struct nx_sg *end, unsigned int delta)
+static long int trim_sg_list(struct nx_sg *sg,
+			     struct nx_sg *end,
+			     unsigned int delta,
+			     unsigned int *nbytes)
 {
+	long int oplen;
+	long int data_back;
+	unsigned int is_delta = delta;
+
 	while (delta && end > sg) {
 		struct nx_sg *last = end - 1;
 
@@ -228,7 +235,20 @@ static long int trim_sg_list(struct nx_s
 			delta -= last->len;
 		}
 	}
-	return (sg - end) * sizeof(struct nx_sg);
+
+	/* There are cases where we need to crop list in order to make it
+	 * a block size multiple, but we also need to align data. In order to
+	 * that we need to calculate how much we need to put back to be
+	 * processed
+	 */
+	oplen = (sg - end) * sizeof(struct nx_sg);
+	if (is_delta) {
+		data_back = (abs(oplen) / AES_BLOCK_SIZE) *  sg->len;
+		data_back = *nbytes - (data_back & ~(AES_BLOCK_SIZE - 1));
+		*nbytes -= data_back;
+	}
+
+	return oplen;
 }
 
 /**
@@ -330,8 +350,8 @@ int nx_build_sg_lists(struct nx_crypto_c
 	/* these lengths should be negative, which will indicate to phyp that
 	 * the input and output parameters are scatterlists, not linear
 	 * buffers */
-	nx_ctx->op.inlen = trim_sg_list(nx_ctx->in_sg, nx_insg, delta);
-	nx_ctx->op.outlen = trim_sg_list(nx_ctx->out_sg, nx_outsg, delta);
+	nx_ctx->op.inlen = trim_sg_list(nx_ctx->in_sg, nx_insg, delta, nbytes);
+	nx_ctx->op.outlen = trim_sg_list(nx_ctx->out_sg, nx_outsg, delta, nbytes);
 
 	return 0;
 }


Patches currently in stable-queue which might be from leosilva@linux.vnet.ibm.com are

queue-4.1/crypto-nx-fixing-nx-data-alignment-with-nx_sg-list.patch
queue-4.1/crypto-nx-fixing-sha-update-bug.patch