crypto: tegra - Fix IV usage for AES ECB

JIRA: https://issues.redhat.com/browse/RHEL-89531
Upstream Status: linux.git

commit 1ddaff4
Author: Akhil R <akhilrajeev@nvidia.com>
Date:   Wed Mar 26 20:21:10 2025 +0530

    crypto: tegra - Fix IV usage for AES ECB

    Modifying the crypto_request turns out to be not the right way to handle
    the stale value issue with the IV. Though the IV is not used for AES ECB,
    it eventually get used in algorithms like LRW in the next step after
    AES ECB encryption/decryption. Setting req->iv to NULL breaks the
    implementation of such algorithms. Hence modify only the local reqctx
    to check for IV.

    Fixes: bde5582 ("crypto: tegra - Set IV to NULL explicitly for AES ECB")
    Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Herbert Xu <herbert.xu@redhat.com>

Author: Herbert Xu

drivers/crypto/tegra/tegra-se-aes.c

@@ -269,7 +269,7 @@ static int tegra_aes_do_one_req(struct crypto_engine *engine, void *areq)
 	unsigned int cmdlen, key1_id, key2_id;
 	int ret;
 
-	rctx->iv = (u32 *)req->iv;
+	rctx->iv = (ctx->alg == SE_ALG_ECB) ? NULL : (u32 *)req->iv;
 	rctx->len = req->cryptlen;
 	key1_id = ctx->key1_id;
 	key2_id = ctx->key2_id;
@@ -498,9 +498,6 @@ 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;
 
 	return crypto_transfer_skcipher_request_to_engine(ctx->se->engine, req);