When parsing environment block, check each its line for the
compliance with the 'foo=bar\n' pattern. In case of missing '=',
or '\n' abort the parsing procedure with a warning message.
Without this check, stage3 may write a zero byte to the absolute
address 0 (robustness defect)
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
bd52e14740