linux-kernel - [PATCH 04/18] security/keys: use kvfree

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Date:   Wed, 09 Dec 2020 12:14:57 +0000
From:   David Howells <dhowells@...hat.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Denis Efremov <efremov@...ux.com>, dhowells@...hat.com,
        keyrings@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 04/18] security/keys: use kvfree_sensitive()

From: Denis Efremov <efremov@...ux.com>

Use kvfree_sensitive() instead of open-coding it.

Signed-off-by: Denis Efremov <efremov@...ux.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---

 security/keys/big_key.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/security/keys/big_key.c b/security/keys/big_key.c
index 691347dea3c1..d17e5f09eeb8 100644
--- a/security/keys/big_key.c
+++ b/security/keys/big_key.c
@@ -121,8 +121,7 @@ int big_key_preparse(struct key_preparsed_payload *prep)
 		*path = file->f_path;
 		path_get(path);
 		fput(file);
-		memzero_explicit(buf, enclen);
-		kvfree(buf);
+		kvfree_sensitive(buf, enclen);
 	} else {
 		/* Just store the data in a buffer */
 		void *data = kmalloc(datalen, GFP_KERNEL);
@@ -140,8 +139,7 @@ int big_key_preparse(struct key_preparsed_payload *prep)
 err_enckey:
 	kfree_sensitive(enckey);
 error:
-	memzero_explicit(buf, enclen);
-	kvfree(buf);
+	kvfree_sensitive(buf, enclen);
 	return ret;
 }
 
@@ -273,8 +271,7 @@ long big_key_read(const struct key *key, char *buffer, size_t buflen)
 err_fput:
 		fput(file);
 error:
-		memzero_explicit(buf, enclen);
-		kvfree(buf);
+		kvfree_sensitive(buf, enclen);
 	} else {
 		ret = datalen;
 		memcpy(buffer, key->payload.data[big_key_data], datalen);