linux-kernel - [PATCH AUTOSEL 4.14 106/186] crypto: atmel-sha - fix error handling when setting hmac key

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Date:   Fri, 14 Feb 2020 11:15:55 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Eric Biggers <ebiggers@...gle.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <sashal@...nel.org>, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.14 106/186] crypto: atmel-sha - fix error handling when setting hmac key

From: Eric Biggers <ebiggers@...gle.com>

[ Upstream commit b529f1983b2dcc46354f311feda92e07b6e9e2da ]

HMAC keys can be of any length, and atmel_sha_hmac_key_set() can only
fail due to -ENOMEM.  But atmel_sha_hmac_setkey() incorrectly treated
any error as a "bad key length" error.  Fix it to correctly propagate
the -ENOMEM error code and not set any tfm result flags.

Fixes: 81d8750b2b59 ("crypto: atmel-sha - add support to hmac(shaX)")
Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: Ludovic Desroches <ludovic.desroches@...rochip.com>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/crypto/atmel-sha.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c
index 3e2f41b3eaf3a..15e68774034ae 100644
--- a/drivers/crypto/atmel-sha.c
+++ b/drivers/crypto/atmel-sha.c
@@ -1921,12 +1921,7 @@ static int atmel_sha_hmac_setkey(struct crypto_ahash *tfm, const u8 *key,
 {
 	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
 
-	if (atmel_sha_hmac_key_set(&hmac->hkey, key, keylen)) {
-		crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
-		return -EINVAL;
-	}
-
-	return 0;
+	return atmel_sha_hmac_key_set(&hmac->hkey, key, keylen);
 }
 
 static int atmel_sha_hmac_init(struct ahash_request *req)
-- 
2.20.1