linux-kernel - [PATCH v4] KEYS: use kfree

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Message-ID: <20230717125509.105015-1-mngyadam@amazon.com>
Date:   Mon, 17 Jul 2023 12:55:09 +0000
From:   Mahmoud Adam <mngyadam@...zon.com>
To:     <dhowells@...hat.com>
CC:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <keyrings@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Mahmoud Adam <mngyadam@...zon.com>
Subject: [PATCH v4] KEYS: use kfree_sensitive with key

key might contain private part of the key, so better use
kfree_sensitive to free it

Signed-off-by: Mahmoud Adam <mngyadam@...zon.com>
---
 crypto/asymmetric_keys/public_key.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 773e159dbbcb..abeecb8329b3 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -42,7 +42,7 @@ static void public_key_describe(const struct key *asymmetric_key,
 void public_key_free(struct public_key *key)
 {
 	if (key) {
-		kfree(key->key);
+		kfree_sensitive(key->key);
 		kfree(key->params);
 		kfree(key);
 	}
@@ -263,7 +263,7 @@ static int software_key_query(const struct kernel_pkey_params *params,
 	else
 		crypto_free_akcipher(tfm);
 error_free_key:
-	kfree(key);
+	kfree_sensitive(key);
 	pr_devel("<==%s() = %d\n", __func__, ret);
 	return ret;
 }
@@ -369,7 +369,7 @@ static int software_key_eds_op(struct kernel_pkey_params *params,
 	else
 		crypto_free_akcipher(tfm);
 error_free_key:
-	kfree(key);
+	kfree_sensitive(key);
 	pr_devel("<==%s() = %d\n", __func__, ret);
 	return ret;
 }
@@ -441,7 +441,7 @@ int public_key_verify_signature(const struct public_key *pkey,
 				sig->digest, sig->digest_size);
 
 error_free_key:
-	kfree(key);
+	kfree_sensitive(key);
 error_free_tfm:
 	crypto_free_sig(tfm);
 	pr_devel("<==%s() = %d\n", __func__, ret);
-- 
2.40.1