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commit50b8a74285upstream. Since Grub may align the size of initrd to 4 if user pass initrd from cpio, we have to check the preceding 3 bytes as well. Link: https://lkml.kernel.org/r/160520205132.303174.4876760192433315429.stgit@devnote2 Cc: stable@vger.kernel.org Fixes:85c46b78da("bootconfig: Add bootconfig magic word for indicating bootconfig explicitly") Reported-by: Chen Yu <yu.chen.surf@gmail.com> Tested-by: Chen Yu <yu.chen.surf@gmail.com> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>