# \[PATCH 01/10\] dm snapshot: Use kmalloc\_array() in init\_origin\_hash()

- From: SF Markus Elfring \<hidden\>
- Date: 2016-09-29 09:08:20 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2016/09/4845851
- Thread: https://ratatoskr.run/linux-raid/2016/09/4845849/t.md

```text
From: Markus Elfring <redacted>
Date: Wed, 28 Sep 2016 22:20:08 +0200

* Multiplications for the size determination of memory allocations
  indicated that array data structures should be processed.
  Thus use the corresponding function "kmalloc_array".

  This issue was detected by using the Coccinelle software.

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

Signed-off-by: Markus Elfring <redacted>
---
 drivers/md/dm-snap.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index c65feea..f262f7e 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -326,8 +326,9 @@ static int init_origin_hash(void)
 {
 	int i;
 
-	_origins = kmalloc(ORIGIN_HASH_SIZE * sizeof(struct list_head),
-			   GFP_KERNEL);
+	_origins = kmalloc_array(ORIGIN_HASH_SIZE,
+				 sizeof(*_origins),
+				 GFP_KERNEL);
 	if (!_origins) {
 		DMERR("unable to allocate memory for _origins");
 		return -ENOMEM;
@@ -335,8 +336,9 @@ static int init_origin_hash(void)
 	for (i = 0; i < ORIGIN_HASH_SIZE; i++)
 		INIT_LIST_HEAD(_origins + i);
 
-	_dm_origins = kmalloc(ORIGIN_HASH_SIZE * sizeof(struct list_head),
-			      GFP_KERNEL);
+	_dm_origins = kmalloc_array(ORIGIN_HASH_SIZE,
+				    sizeof(*_dm_origins),
+				    GFP_KERNEL);
 	if (!_dm_origins) {
 		DMERR("unable to allocate memory for _dm_origins");
 		kfree(_origins);
-- 
2.10.0

```