linux-kernel - Re: Build failure with GCC 15 due to -Werror=unterminated-string-initialization

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Message-ID: <vch6gmzqaeo22c7473qyabrfwxlkdhx5vgvosjyp5l2nwgqnxl@5x3ny35qyfgx>
Date: Thu, 3 Oct 2024 12:22:29 +0530
From: Brahmajit <brahmajit.xyz@...il.com>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, 
	Christian Brauner <brauner@...nel.org>
Subject: Re: Build failure with GCC 15 due to
 -Werror=unterminated-string-initialization

On 02.10.2024 22:54, Al Viro wrote:
> ... and looking at the actual code using that, just lose the entire
> array -
> 	if (memcmp(dir_entry[0].de_fname, ".", 2) ||
> 	    memcmp(dir_entry[1].de_fname, "..", 3))
> 		error = 1;
> and be done with that.

Hey sorry for the initial bad code, I'm just starting out. With your
recommendation I wrote this, does this look good?

--- a/fs/qnx6/inode.c
+++ b/fs/qnx6/inode.c
@@ -179,8 +179,7 @@ static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf)
  */
 static const char *qnx6_checkroot(struct super_block *s)
 {
-	static char match_root[2][3] = {".\0\0", "..\0"};
-	int i, error = 0;
+	int error = 0;
 	struct qnx6_dir_entry *dir_entry;
 	struct inode *root = d_inode(s->s_root);
 	struct address_space *mapping = root->i_mapping;
@@ -189,11 +188,9 @@ static const char *qnx6_checkroot(struct super_block *s)
 	if (IS_ERR(folio))
 		return "error reading root directory";
 	dir_entry = kmap_local_folio(folio, 0);
-	for (i = 0; i < 2; i++) {
-		/* maximum 3 bytes - due to match_root limitation */
-		if (strncmp(dir_entry[i].de_fname, match_root[i], 3))
-			error = 1;
-	}
+	if (memcmp(dir_entry[0].de_fname, ".", 2) ||
+	    memcmp(dir_entry[1].de_fname, "..", 3))
+		error = 1;
 	folio_release_kmap(folio, dir_entry);
 	if (error)
 		return "error reading root directory.";

-- 
Regards,
listout