From: Richard Weinberger <richard@nod.at>
Date: Tue, 3 Mar 2015 22:41:52 +0000 (+0100)
Subject: hostfs: Add a BUG_ON to detect behavior changes of dentry_path_raw()
X-Git-Tag: v4.1-rc1~121^2~20
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=aad50b1e06081de0e4ff25335ab6f52e58bfcef1;p=karo-tx-linux.git

hostfs: Add a BUG_ON to detect behavior changes of dentry_path_raw()

hostfs' __dentry_name() relies on the fact that dentry_path_raw() will place
the path name at the end of the provided buffer.
While this is okay, add a BUG_ON() to detect behavior changes as soon
as possible.

Signed-off-by: Richard Weinberger <richard@nod.at>
---

diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 67e556cbfd82..3082a7e715dd 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -93,6 +93,13 @@ static char *__dentry_name(struct dentry *dentry, char *name)
 		__putname(name);
 		return NULL;
 	}
+
+	/*
+	 * This function relies on the fact that dentry_path_raw() will place
+	 * the path name at the end of the provided buffer.
+	 */
+	BUG_ON(p + strlen(p) + 1 != name + PATH_MAX);
+
 	strlcpy(name, root, PATH_MAX);
 	if (len > p - name) {
 		__putname(name);