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Fix for memory allocate to not run outside the range of xms handles.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@590
This commit is contained in:
Sjoerd van der Berg 2002-12-22 13:13:51 +00:00
parent 4665b9b268
commit f1fd4ae696
1 changed files with 4 additions and 3 deletions
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7
src/ints/xms.cpp
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@ -118,7 +118,8 @@ Bitu XMS_Handler(void) {
case XMS_LOCAL_ENABLE_A20: /* 05 */
case XMS_LOCAL_DISABLE_A20: /* 06 */
case XMS_QUERY_A20: /* 07 */
LOG_WARN("XMS:Unhandled call %2X",reg_ah);break;
LOG_WARN("XMS:Unhandled call %2X",reg_ah);
break;
case XMS_QUERY_FREE_EXTENDED_MEMORY: /* 08 */
/* Scan the tree for free memory and find largest free block */
{
@ -177,7 +178,7 @@ foundnew:
return CBRET_NONE;
}
/* Not a free block or too small advance to next one if possible */
if (xms_handles[index].next) index=xms_handles[index].next;
if (xms_handles[index].next < XMS_HANDLES ) index=xms_handles[index].next;
else break;
}
/* Found no good blocks give some errors */
@ -311,7 +312,7 @@ foundnew:
}
reg_bh=xms_handles[reg_dx].locked;
/* Find available blocks */
reg_bx=0;{ for (Bitu i=0;i<XMS_HANDLES;i++) if (!xms_handles[i].data) reg_bx++;}
reg_bx=0;{ for (Bitu i=1;i<XMS_HANDLES;i++) if (!xms_handles[i].data) reg_bx++;}
reg_dx=xms_handles[reg_dx].size;
break;
case XMS_RESIZE_EXTENDED_MEMORY_BLOCK: /* 0f */