linux-kernel - [PATCH v2 08/10] crypto: tegra: Set IV to NULL explicitly for AES ECB

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Message-ID: <20250211171713.65770-9-akhilrajeev@nvidia.com>
Date: Tue, 11 Feb 2025 22:47:11 +0530
From: Akhil R <akhilrajeev@...dia.com>
To: <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
	<thierry.reding@...il.com>, <jonathanh@...dia.com>,
	<linux-crypto@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: Akhil R <akhilrajeev@...dia.com>
Subject: [PATCH v2 08/10] crypto: tegra: Set IV to NULL explicitly for AES ECB

It may happen that the variable req->iv may have stale values or
zero sized buffer by default and may end up getting used during
encryption/decryption. This inturn may corrupt the results or break the
operation. Set the req->iv variable to NULL explicitly for algorithms
like AES-ECB where IV is not used.

Fixes: 0880bb3b00c8 ("crypto: tegra - Add Tegra Security Engine driver")
Signed-off-by: Akhil R <akhilrajeev@...dia.com>
---
 drivers/crypto/tegra/tegra-se-aes.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/tegra/tegra-se-aes.c b/drivers/crypto/tegra/tegra-se-aes.c
index c97dc2043b3d..196f3b7ad7bb 100644
--- a/drivers/crypto/tegra/tegra-se-aes.c
+++ b/drivers/crypto/tegra/tegra-se-aes.c
@@ -446,6 +446,9 @@ static int tegra_aes_crypt(struct skcipher_request *req, bool encrypt)
 	if (!req->cryptlen)
 		return 0;
 
+	if (ctx->alg == SE_ALG_ECB)
+		req->iv = NULL;
+
 	rctx->encrypt = encrypt;
 	rctx->config = tegra234_aes_cfg(ctx->alg, encrypt);
 	rctx->crypto_config = tegra234_aes_crypto_cfg(ctx->alg, encrypt);
-- 
2.43.2