linux-kernel - [PATCH 4/5] target: Use kmalloc_array() in compare_and_write

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Message-ID: <4629f13b-fd09-8d27-8cd4-3440f13207b0@users.sourceforge.net>
Date:   Sun, 9 Apr 2017 21:51:43 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        Bart Van Assche <bart.vanassche@...disk.com>,
        "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 4/5] target: Use kmalloc_array() in
 compare_and_write_callback()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 9 Apr 2017 20:25:11 +0200

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

  This issue was detected by using the Coccinelle software.

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

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/target/target_core_sbc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index ee35c90e3b8d..a7fa4a7339db 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -519,8 +519,8 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool succes
 		goto out;
 	}
 
-	write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
-			   GFP_KERNEL);
+	write_sg = kmalloc_array(cmd->t_data_nents, sizeof(*write_sg),
+				 GFP_KERNEL);
 	if (!write_sg) {
 		pr_err("Unable to allocate compare_and_write sg\n");
 		ret = TCM_OUT_OF_RESOURCES;
-- 
2.12.2