From: Tudor-Dan Ambarus <tudor.ambarus@microchip.com>
Date: Fri, 23 Mar 2018 10:42:22 +0000 (+0200)
Subject: crypto: picoxcell - don't leak pointers to authenc keys
X-Git-Tag: for-linus-20180413~44^2~5
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=a664b4b140678d06825467a52885c0e8d46ac0ed;p=linux-block.git

crypto: picoxcell - don't leak pointers to authenc keys

In spacc_aead_setkey we save pointers to the authenc keys in a
local variable of type struct crypto_authenc_keys and we don't
zeroize it after use. Fix this and don't leak pointers to the
authenc keys.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/drivers/crypto/picoxcell_crypto.c b/drivers/crypto/picoxcell_crypto.c
index 4ef52c9d72fc..a4df966adbf6 100644
--- a/drivers/crypto/picoxcell_crypto.c
+++ b/drivers/crypto/picoxcell_crypto.c
@@ -499,10 +499,12 @@ static int spacc_aead_setkey(struct crypto_aead *tfm, const u8 *key,
 	memcpy(ctx->hash_ctx, keys.authkey, keys.authkeylen);
 	ctx->hash_key_len = keys.authkeylen;
 
+	memzero_explicit(&keys, sizeof(keys));
 	return 0;
 
 badkey:
 	crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+	memzero_explicit(&keys, sizeof(keys));
 	return -EINVAL;
 }