linux-kernel - [PATCH 3/8] crypto: stm32/cryp

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Message-ID: <20211029135454.4383-4-nicolas.toromanoff@foss.st.com>
Date:   Fri, 29 Oct 2021 15:54:49 +0200
From:   Nicolas Toromanoff <nicolas.toromanoff@...s.st.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC:     Marek Vasut <marex@...x.de>,
        Nicolas Toromanoff <nicolas.toromanoff@...s.st.com>,
        <linux-crypto@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/8] crypto: stm32/cryp - fix CTR counter carry

Fix issue in CTR counter overflow, the carry-over is now properly
managed.
Fixes: bbb2832620ac ("crypto: stm32 - Fix sparse warnings")

Signed-off-by: Nicolas Toromanoff <nicolas.toromanoff@...s.st.com>
---
 drivers/crypto/stm32/stm32-cryp.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c
index 7b55ad6d2f1a..6eeeca0d70ce 100644
--- a/drivers/crypto/stm32/stm32-cryp.c
+++ b/drivers/crypto/stm32/stm32-cryp.c
@@ -163,7 +163,7 @@ struct stm32_cryp {
 	struct scatter_walk     in_walk;
 	struct scatter_walk     out_walk;
 
-	u32                     last_ctr[4];
+	__be32                  last_ctr[4];
 	u32                     gcm_ctr;
 };
 
@@ -1219,25 +1219,26 @@ static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp)
 
 	if (unlikely(cryp->last_ctr[3] == 0xFFFFFFFF)) {
 		cryp->last_ctr[3] = 0;
-		cryp->last_ctr[2]++;
+		cryp->last_ctr[2] = cpu_to_be32(be32_to_cpu(cryp->last_ctr[2]) + 1);
 		if (!cryp->last_ctr[2]) {
-			cryp->last_ctr[1]++;
+			cryp->last_ctr[1] = cpu_to_be32(be32_to_cpu(cryp->last_ctr[1]) + 1);
 			if (!cryp->last_ctr[1])
-				cryp->last_ctr[0]++;
+				cryp->last_ctr[0] = cpu_to_be32(be32_to_cpu(cryp->last_ctr[0]) + 1);
 		}
 
 		cr = stm32_cryp_read(cryp, CRYP_CR);
 		stm32_cryp_write(cryp, CRYP_CR, cr & ~CR_CRYPEN);
 
-		stm32_cryp_hw_write_iv(cryp, (__be32 *)cryp->last_ctr);
+		stm32_cryp_hw_write_iv(cryp, cryp->last_ctr);
 
 		stm32_cryp_write(cryp, CRYP_CR, cr);
 	}
 
-	cryp->last_ctr[0] = stm32_cryp_read(cryp, CRYP_IV0LR);
-	cryp->last_ctr[1] = stm32_cryp_read(cryp, CRYP_IV0RR);
-	cryp->last_ctr[2] = stm32_cryp_read(cryp, CRYP_IV1LR);
-	cryp->last_ctr[3] = stm32_cryp_read(cryp, CRYP_IV1RR);
+	/* The IV registers are BE  */
+	cryp->last_ctr[0] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0LR));
+	cryp->last_ctr[1] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0RR));
+	cryp->last_ctr[2] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1LR));
+	cryp->last_ctr[3] = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1RR));
 }
 
 static bool stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
-- 
2.17.1