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Check to see if we've reached the end of the map before attempting to

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skip past an empty region, otherwise we end up generating an infinitely
long e820 map.  (Yes, there *are* real systems that provide e820 maps
with a zero-length region at the end...)
This commit is contained in:
Michael Brown 2006-08-31 13:25:45 +00:00
parent c399e88aa3
commit 78dd963c1f
1 changed files with 5 additions and 0 deletions
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5
src/arch/i386/firmware/pcbios/e820mangler.S
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@ -361,7 +361,12 @@ int15_e820:
pushl %edx
call split_e820
pushfw
/* Skip empty region checking if we've reached the end of the
* map or hit an error, to avoid a potential endless loop.
*/
jc 1f
testl %ebx, %ebx
jz 1f
/* Check for an empty region */
pushl %eax
movl %es:8(%di), %eax