linux-kernel - [PATCH 10/14] crypto: inside-secure

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Date:   Mon, 27 May 2019 16:51:02 +0200
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, maxime.chevallier@...tlin.com,
        gregory.clement@...tlin.com, miquel.raynal@...tlin.com,
        nadavh@...vell.com, igall@...vell.com
Subject: [PATCH 10/14] crypto: inside-secure - fix queued len computation

This patch fixes the queued len computation, which could theoretically
be wrong if req->len[1] - req->processed[1] > 1. Be future-proof here,
and fix it.

Fixes: b460edb6230a ("crypto: inside-secure - sha512 support")
Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>
---
 drivers/crypto/inside-secure/safexcel_hash.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/inside-secure/safexcel_hash.c b/drivers/crypto/inside-secure/safexcel_hash.c
index ba0732fd4ed4..a9197d2c5a48 100644
--- a/drivers/crypto/inside-secure/safexcel_hash.c
+++ b/drivers/crypto/inside-secure/safexcel_hash.c
@@ -50,10 +50,12 @@ struct safexcel_ahash_req {
 
 static inline u64 safexcel_queued_len(struct safexcel_ahash_req *req)
 {
-	if (req->len[1] > req->processed[1])
-		return 0xffffffff - (req->len[0] - req->processed[0]);
+	u64 len, processed;
 
-	return req->len[0] - req->processed[0];
+	len = (0xffffffff * req->len[1]) + req->len[0];
+	processed = (0xffffffff * req->processed[1]) + req->processed[0];
+
+	return len - processed;
 }
 
 static void safexcel_hash_token(struct safexcel_command_desc *cdesc,
-- 
2.21.0