From: Eric Biggers <ebiggers@google.com>
Date: Tue, 31 Dec 2019 03:19:33 +0000 (-0600)
Subject: crypto: atmel-sha - fix error handling when setting hmac key
X-Git-Tag: v4.19.104~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b772f3c499aac9a5d95ff2fddeb99a721ed39a80;p=thirdparty%2Fkernel%2Fstable.git

crypto: atmel-sha - fix error handling when setting hmac key

commit b529f1983b2dcc46354f311feda92e07b6e9e2da upstream.

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@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c
index ef125d4be8fc4..cb548a0506c54 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)