linux-kernel - [PATCH 13/14] drivers/mtd/ubi/build.c: fix error return code

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Message-Id: <1345365870-29831-14-git-send-email-Julia.Lawall@lip6.fr>
Date:	Sun, 19 Aug 2012 10:44:29 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Artem Bityutskiy <dedekind1@...il.com>
Cc:	kernel-janitors@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 13/14] drivers/mtd/ubi/build.c: fix error return code

From: Julia Lawall <Julia.Lawall@...6.fr>

Initialize return variable before exiting on an error path.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
(
if@p1 (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret@p1 = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}

// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/mtd/ubi/build.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 7b6b5f9..afe9075 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1159,8 +1159,10 @@ static int __init ubi_init(void)
 	ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab",
 					      sizeof(struct ubi_wl_entry),
 					      0, 0, NULL);
-	if (!ubi_wl_entry_slab)
+	if (!ubi_wl_entry_slab) {
+		err = -ENOMEM;
 		goto out_dev_unreg;
+	}
 
 	err = ubi_debugfs_init();
 	if (err)

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