linux-kernel - [PATCH 01/10] md/dm-crypt: Use kcalloc() in crypt_alloc

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Date:   Wed, 28 Sep 2016 17:36:45 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     dm-devel@...hat.com, linux-raid@...r.kernel.org,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, Shaohua Li <shli@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 01/10] md/dm-crypt: Use kcalloc() in crypt_alloc_tfms()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 28 Sep 2016 13:26:22 +0200

* A multiplication for the size determination of a memory allocation
  indicated that an array data structure should be processed.
  Thus reuse the corresponding function "kcalloc".

  This issue was detected by using the Coccinelle software.

* Replace the specification of a data type by a pointer dereference
  to make the corresponding size determination a bit safer according to
  the Linux coding style convention.

Fixes: 5d0be84ec0cacfc7a6d6ea548afdd07d481324cd ("dm crypt: fix free of bad values after tfm allocation failure")
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/md/dm-crypt.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index a276883..68971a2 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1454,8 +1454,7 @@ static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode)
 	unsigned i;
 	int err;
 
-	cc->tfms = kzalloc(cc->tfms_count * sizeof(struct crypto_skcipher *),
-			   GFP_KERNEL);
+	cc->tfms = kcalloc(cc->tfms_count, sizeof(*cc->tfms), GFP_KERNEL);
 	if (!cc->tfms)
 		return -ENOMEM;
 
-- 
2.10.0