linux-kernel - Re: [PATCH 4/4] fs/qnx4: decrement sizeof size in strncmp

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Message-ID: <20091112220836.GA3893@alarsen.net>
Date:	Thu, 12 Nov 2009 23:08:36 +0100
From:	Anders Larsen <al@...rsen.net>
To:	Julia Lawall <julia@...u.dk>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, trivial@...nel.org
Subject: Re: [PATCH 4/4] fs/qnx4: decrement sizeof size in strncmp

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

As an identical match is wanted in this case, strcmp can be used instead.

The semantic match that lead to detecting this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression foo;
constant char *abc;
@@

*strncmp(foo, abc, sizeof(abc))
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>
Signed-off-by: Anders Larsen <al@...rsen.net>

---
 fs/qnx4/inode.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
index 449f5a6..150f4af 100644
--- a/fs/qnx4/inode.c
+++ b/fs/qnx4/inode.c
@@ -221,7 +221,8 @@ static const char *qnx4_checkroot(struct super_block *sb)
 				rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
 				if (rootdir->di_fname != NULL) {
 					QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
-					if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
+					if (!strcmp(rootdir->di_fname,
+						    QNX4_BMNAME)) {
 						found = 1;
 						qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
 						if (!qnx4_sb(sb)->BitMap) {


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