linux-kernel - [PATCH] ecryptfs: Simplify ecryptfs_crypto_api_algify_cipher

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Date:   Mon, 30 Oct 2023 14:27:32 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Tyler Hicks <code@...icks.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        ecryptfs@...r.kernel.org
Subject: [PATCH] ecryptfs: Simplify ecryptfs_crypto_api_algify_cipher_name()

Use kasprintf() instead of hand writing it.
It is much less verbose.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 fs/ecryptfs/crypto.c | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 044863c0d824..00d795658cf5 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -23,6 +23,7 @@
 #include <linux/slab.h>
 #include <asm/unaligned.h>
 #include <linux/kernel.h>
+#include <linux/sprintf.h>
 #include <linux/xattr.h>
 #include "ecryptfs_kernel.h"
 
@@ -78,22 +79,12 @@ static int ecryptfs_crypto_api_algify_cipher_name(char **algified_name,
 						  char *cipher_name,
 						  char *chaining_modifier)
 {
-	int cipher_name_len = strlen(cipher_name);
-	int chaining_modifier_len = strlen(chaining_modifier);
-	int algified_name_len;
-	int rc;
+	*algified_name = kasprintf(GFP_KERNEL, "%s(%s)",
+				   chaining_modifier, cipher_name);
+	if (!(*algified_name))
+		return -ENOMEM;
 
-	algified_name_len = (chaining_modifier_len + cipher_name_len + 3);
-	(*algified_name) = kmalloc(algified_name_len, GFP_KERNEL);
-	if (!(*algified_name)) {
-		rc = -ENOMEM;
-		goto out;
-	}
-	snprintf((*algified_name), algified_name_len, "%s(%s)",
-		 chaining_modifier, cipher_name);
-	rc = 0;
-out:
-	return rc;
+	return 0;
 }
 
 /**
-- 
2.34.1