linux-kernel - [PATCH 3.16 04/99] pcrypt: use format specifier in kobject

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Message-ID: <lsq.1554212307.546629128@decadent.org.uk>
Date:   Tue, 02 Apr 2019 14:38:27 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Herbert Xu" <herbert@...dor.apana.org.au>,
        "Colin Ian King" <colin.king@...onical.com>
Subject: [PATCH 3.16 04/99] pcrypt: use format specifier in kobject_add

3.16.65-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@...onical.com>

commit b1e3874c75ab15288f573b3532e507c37e8e7656 upstream.

Passing string 'name' as the format specifier is potentially hazardous
because name could (although very unlikely to) have a format specifier
embedded in it causing issues when parsing the non-existent arguments
to these.  Follow best practice by using the "%s" format string for
the string 'name'.

Cleans up clang warning:
crypto/pcrypt.c:397:40: warning: format string is not a string literal
(potentially insecure) [-Wformat-security]

Fixes: a3fb1e330dd2 ("pcrypt: Added sysfs interface to pcrypt")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 crypto/pcrypt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -440,7 +440,7 @@ static int pcrypt_sysfs_add(struct padat
 	int ret;
 
 	pinst->kobj.kset = pcrypt_kset;
-	ret = kobject_add(&pinst->kobj, NULL, name);
+	ret = kobject_add(&pinst->kobj, NULL, "%s", name);
 	if (!ret)
 		kobject_uevent(&pinst->kobj, KOBJ_ADD);