fuse: readdir: check for slash in names
Userspace can add names containing a slash character to the directory
listing. Don't allow this as it could cause all sorts of trouble.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: stable@vger.kernel.org
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index c8334f7..8fec28f 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1174,6 +1174,8 @@
return -EIO;
if (reclen > nbytes)
break;
+ if (memchr(dirent->name, '/', dirent->namelen) != NULL)
+ return -EIO;
if (!dir_emit(ctx, dirent->name, dirent->namelen,
dirent->ino, dirent->type))
@@ -1320,6 +1322,8 @@
return -EIO;
if (reclen > nbytes)
break;
+ if (memchr(dirent->name, '/', dirent->namelen) != NULL)
+ return -EIO;
if (!over) {
/* We fill entries into dstbuf only as much as