linux-kernel - [PATCH] qla4xxx: Return -ENOMEM on memory allocation failure

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Date:	Fri, 4 Jul 2014 23:57:56 +0530
From:	Himangi Saraogi <himangi774@...il.com>
To:	Vikas Chaudhary <vikas.chaudhary@...gic.com>,
	iscsi-driver@...gic.com,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: [PATCH] qla4xxx: Return -ENOMEM on memory allocation failure

In this code, 0 is returned on memory allocation failure, even though
other failures return -ENOMEM or other similar values.

A simplified version of the Coccinelle semantic match that finds this
problem is as follows:

// <smpl>
@@
expression ret;
expression x,e1,e2,e3;
identifier alloc;
@@

ret = 0
... when != ret = e1
*x = alloc(...)
... when != ret = e2
if (x == NULL) { ... when != ret = e3
  return ret;
}
// </smpl>

Signed-off-by: Himangi Saraogi <himangi774@...il.com>
Acked-by: Julia Lawall <julia.lawall@...6.fr>
---
 drivers/scsi/qla4xxx/ql4_os.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index c5d9564..72ba671 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -1050,6 +1050,7 @@ static int qla4xxx_get_host_stats(struct Scsi_Host *shost, char *buf, int len)
 	if (!ql_iscsi_stats) {
 		ql4_printk(KERN_ERR, ha,
 			   "Unable to allocate memory for iscsi stats\n");
+		ret = -ENOMEM;
 		goto exit_host_stats;
 	}
 
-- 
1.9.1

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