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Btrfs: copy string correctly in INO_LOOKUP ioctl

Memory areas [ptr, ptr+total_len] and [name, name+total_len]
may overlap, so it's wrong to use memcpy().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Li Zefan %!s(int64=14) %!d(string=hai) anos
pai
achega
77906a5075
Modificáronse 1 ficheiros con 1 adicións e 2 borrados
  1. 1 2
      fs/btrfs/ioctl.c

+ 1 - 2
fs/btrfs/ioctl.c

@@ -1757,11 +1757,10 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
 		key.objectid = key.offset;
 		key.offset = (u64)-1;
 		dirid = key.objectid;
-
 	}
 	if (ptr < name)
 		goto out;
-	memcpy(name, ptr, total_len);
+	memmove(name, ptr, total_len);
 	name[total_len]='\0';
 	ret = 0;
 out: