linux-kernel - [PATCH 6/9] fs/romfs: correct error-handling code

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Message-ID: <Pine.LNX.4.64.0907281754250.28189@ask.diku.dk>
Date:	Tue, 28 Jul 2009 17:54:58 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 6/9] fs/romfs: correct error-handling code

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

romfs_iget returns an ERR_PTR value in an error case instead of NULL.

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

// <smpl>
@match exists@
expression x, E;
statement S1, S2;
@@

x = romfs_iget(...)
... when != x = E
(
*  if (x == NULL || ...) S1 else S2
|
*  if (x == NULL && ...) S1 else S2
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 fs/romfs/super.c                    |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/romfs/super.c b/fs/romfs/super.c
index 4ab3c03..7f733fb 100644
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
@@ -528,7 +528,7 @@ static int romfs_fill_super(struct super_block *sb, void *data, int silent)
 	pos = (ROMFH_SIZE + len + 1 + ROMFH_PAD) & ROMFH_MASK;
 
 	root = romfs_iget(sb, pos);
-	if (!root)
+	if (IS_ERR(root))
 		goto error;
 
 	sb->s_root = d_alloc_root(root);
--
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