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Masami Hiramatsu authored
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: 85c46b78 ("bootconfig: Add bootconfig magic word for indicating bootconfig explicitly")
Reported-by: default avatarChen Yu <yu.chen.surf@gmail.com>
Tested-by: default avatarChen Yu <yu.chen.surf@gmail.com>
Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
50b8a742