linux-kernel - [PATCH 1/6] drivers/scsi: introduce missing kfree

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Message-ID: <Pine.LNX.4.64.0902082242290.25891@ask.diku.dk>
Date:	Sun, 8 Feb 2009 22:43:19 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	james.smart@...lex.com, linux-scsi@...r.kernel.org,
	James.Bottomley@...senPartnership.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/6] drivers/scsi: introduce missing kfree

From: Julia Lawall <julia@...u.dk>

Error handling code following a kmalloc should free the allocated data.

The semantic match that finds the problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
statement S;
expression E;
identifier f,l;
position p1,p2;
expression *ptr != NULL;
@@

(
if ((x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...)) == NULL) S
|
x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
)
<... when != x
     when != if (...) { <+...x...+> }
x->f = E
...>
(
 return \(0\|<+...x...+>\|ptr\);
|
 return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>
---
 drivers/scsi/lpfc/lpfc_els.c        |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index a8f30bd..a730248 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -5258,6 +5258,7 @@ lpfc_send_els_event(struct lpfc_vport *vport,
 			sizeof(struct lpfc_name));
 		break;
 	default:
+		kfree(els_data);
 		return;
 	}
 	memcpy(els_data->wwpn, &ndlp->nlp_portname, sizeof(struct lpfc_name));
--
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