linux-kernel - [PATCH] Staging: lustre: obdclass: Use kasprintf instead of kzalloc and sprintf

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Date:	Thu,  6 Aug 2015 16:31:50 +0530
From:	Shraddha Barke <shraddha.6596@...il.com>
To:	Andreas Dilger <andreas.dilger@...el.com>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Greg Donald <gdonald@...il.com>, Joe Perches <joe@...ches.com>,
	HPDD-discuss@...ts.01.org, linux-kernel@...r.kernel.org,
	Oleg Drokin <oleg.drokin@...el.com>
Cc:	Shraddha Barke <shraddha.6596@...il.com>
Subject: [PATCH] Staging: lustre: obdclass: Use kasprintf instead of kzalloc and sprintf

This patch uses kasprintf which combines kzalloc and sprintf.

kasprintf also takes care of the size calculation.

Semantic patch used is as follows:

@@
expression a,flag;
expression list args;
statement S;
@@

 a =
- \(kmalloc\|kzalloc\)(...,flag)
+ kasprintf (flag,args)
  <... when != a
  if (a == NULL || ...) S
  ...>
- sprintf(a,args);

Signed-off-by: Shraddha Barke <shraddha.6596@...il.com>
---
 drivers/staging/lustre/lustre/obdclass/obd_config.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/lustre/lustre/obdclass/obd_config.c b/drivers/staging/lustre/lustre/obdclass/obd_config.c
index 93805ac..e0470c0 100644
--- a/drivers/staging/lustre/lustre/obdclass/obd_config.c
+++ b/drivers/staging/lustre/lustre/obdclass/obd_config.c
@@ -1455,14 +1455,13 @@ int class_config_llog_handler(const struct lu_env *env,
 			inst = 1;
 			inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
 				   sizeof(clli->cfg_instance) * 2 + 4;
-			inst_name = kzalloc(inst_len, GFP_NOFS);
+			inst_name = kasprintf(GFP_NOFS, "%s-%p",
+					      lustre_cfg_string(lcfg, 0),
+					      clli->cfg_instance);
 			if (!inst_name) {
 				rc = -ENOMEM;
 				goto out;
 			}
-			sprintf(inst_name, "%s-%p",
-				lustre_cfg_string(lcfg, 0),
-				clli->cfg_instance);
 			lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
 			CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
 			       lcfg->lcfg_command, inst_name);
-- 
2.1.0

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