s390/decompressor: fix initrd corruption caused by bss clear

Reorder the operations in decompress_kernel() to ensure initrd is moved
to a safe location before the bss section is zeroed.

During decompression bss can overlap with the initrd and this can
corrupt the initrd contents depending on the size of the compressed
kernel (which affects where the initrd is placed by the bootloader) and
the size of the bss section of the decompressor.

Also use the correct initrd size when checking for overlaps with
parmblock.

Fixes: 06c0dd72aea3 ([S390] fix boot failures with compressed kernels)
Cc: [email protected]
Reviewed-by: Joy Latten <[email protected]>
Reviewed-by: Vineetha HariPai <[email protected]>
Signed-off-by: Marcelo Henrique Cerri <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>

0 files changed, 0 insertions, 0 deletions