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The 'output' variable is passed from decompress_kernel to check_ipl_parmblock before it is initialized. That disables the safe guard against the overwrite of the ipl parameter block. Fix this by passing the correct value to check_ipl_parmblock. Reported-by: David Binderman <dcb314@hotmail.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>