lkml.org 
[lkml]   [2018]   [Oct]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.14 88/94] crypto: caam/jr - fix ablkcipher_edesc pointer arithmetic
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Horia Geantă <horia.geanta@nxp.com>

commit 13cc6f48c7434ce46ba6dbc90003a136a263d75a upstream.

In some cases the zero-length hw_desc array at the end of
ablkcipher_edesc struct requires for 4B of tail padding.

Due to tail padding and the way pointers to S/G table and IV
are computed:
edesc->sec4_sg = (void *)edesc + sizeof(struct ablkcipher_edesc) +
desc_bytes;
iv = (u8 *)edesc->hw_desc + desc_bytes + sec4_sg_bytes;
first 4 bytes of IV are overwritten by S/G table.

Update computation of pointer to S/G table to rely on offset of hw_desc
member and not on sizeof() operator.

Cc: <stable@vger.kernel.org> # 4.13+
Fixes: 115957bb3e59 ("crypto: caam - fix IV DMA mapping and updating")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/crypto/caam/caamalg.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/crypto/caam/caamalg.c
+++ b/drivers/crypto/caam/caamalg.c
@@ -1511,8 +1511,8 @@ static struct ablkcipher_edesc *ablkciph
edesc->src_nents = src_nents;
edesc->dst_nents = dst_nents;
edesc->sec4_sg_bytes = sec4_sg_bytes;
- edesc->sec4_sg = (void *)edesc + sizeof(struct ablkcipher_edesc) +
- desc_bytes;
+ edesc->sec4_sg = (struct sec4_sg_entry *)((u8 *)edesc->hw_desc +
+ desc_bytes);
edesc->iv_dir = DMA_TO_DEVICE;

/* Make sure IV is located in a DMAable area */
@@ -1715,8 +1715,8 @@ static struct ablkcipher_edesc *ablkciph
edesc->src_nents = src_nents;
edesc->dst_nents = dst_nents;
edesc->sec4_sg_bytes = sec4_sg_bytes;
- edesc->sec4_sg = (void *)edesc + sizeof(struct ablkcipher_edesc) +
- desc_bytes;
+ edesc->sec4_sg = (struct sec4_sg_entry *)((u8 *)edesc->hw_desc +
+ desc_bytes);
edesc->iv_dir = DMA_FROM_DEVICE;

/* Make sure IV is located in a DMAable area */

\
 
 \ /
  Last update: 2018-10-08 21:05    [W:0.319 / U:1.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site