[OpenBIOS] [PATCHv2] bootinfo_load.c: stop parsing CHRP boot script when NULL is reached

[Mark Cave-Ayland]

The Mac OS 9 CHRP boot script consists of a null-terminated Forth string
followed by a large binary payload. Make sure we correctly determine the size
of the bootscript at this point instead of trying to allocate memory for the
entire binary blob which fails due to insufficient memory.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk>
---
 openbios-devel/libopenbios/bootinfo_load.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/openbios-devel/libopenbios/bootinfo_load.c b/openbios-devel/libopenbios/bootinfo_load.c
index fa9e36b..e9b0739 100644
--- a/openbios-devel/libopenbios/bootinfo_load.c
+++ b/openbios-devel/libopenbios/bootinfo_load.c
@@ -161,6 +161,12 @@ bootinfo_init_program(void)
 	feval("load-size");
 	size = POP();
 
+	/* Some bootinfo scripts contain a binary payload after the
+	   NULL-terminated Forth string such as OS 9. Restrict our
+	   size to just the Forth section, otherwise we end up trying
+	   to allocate memory for the entire binary which will fail. */
+	size = strnlen(base, size);
+
 	bootscript = malloc(size);
 	if (bootscript == NULL) {
 		DPRINTF("Can't malloc %d bytes\n", size);
-- 
1.7.10.4