Revert "crypto: talitos - convert to use be16_add_cpu()"

commit 69d9cd8c592f1abce820dbce7181bbbf6812cfbd upstream.

This reverts commit 7291a932c6e27d9768e374e9d648086636daf61c.

The conversion to be16_add_cpu() is incorrect in case cryptlen is
negative due to premature (i.e. before addition / subtraction)
implicit conversion of cryptlen (int -> u16) leading to sign loss.

Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index c52b4b32bcbd..f062158d4dc9 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -925,7 +925,8 @@ static int sg_to_link_tbl(struct scatterlist *sg, int sg_count,
                 sg_count--;
                 link_tbl_ptr--;
         }
-        be16_add_cpu(&link_tbl_ptr->len, cryptlen);
+        link_tbl_ptr->len = cpu_to_be16(be16_to_cpu(link_tbl_ptr->len)
+                                        + cryptlen);
 
         /* tag end of link table */
         link_tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;