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

[ Upstream commit 69d9cd8c592f1abce820dbce7181bbbf6812cfbd ]

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: <stable@vger.kernel.org> # 3.10+
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: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index eb12caa8e94aa4a7796e6ac0f9606aaf8b68914e..307931528eb20545e4d5879e0513b654ca13695b 100644 (file)
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -927,7 +927,8 @@ 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;