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authorRichard Weinberger <richard@nod.at>2015-03-03 23:41:52 +0100
committerRichard Weinberger <richard@nod.at>2015-03-26 23:27:49 +0100
commitaad50b1e06081de0e4ff25335ab6f52e58bfcef1 (patch)
tree66773b2796b62f1204147b551e4d6356d3cf4765
parent41761ddfaecb30e1f0ecac4ce568e3e641d10bec (diff)
downloadlinux-aad50b1e06081de0e4ff25335ab6f52e58bfcef1.tar.bz2
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>
-rw-r--r--fs/hostfs/hostfs_kern.c7
1 files changed, 7 insertions, 0 deletions
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);