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[Qemu-devel] [5563] page_check_range: fix wrap around test (Lauro Ramos
From: |
Andrzej Zaborowski |
Subject: |
[Qemu-devel] [5563] page_check_range: fix wrap around test (Lauro Ramos Venancio). |
Date: |
Tue, 28 Oct 2008 10:24:11 +0000 |
Revision: 5563
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5563
Author: balrog
Date: 2008-10-28 10:24:11 +0000 (Tue, 28 Oct 2008)
Log Message:
-----------
page_check_range: fix wrap around test (Lauro Ramos Venancio).
Move up the warp around test because line
'end = TARGET_PAGE_ALIGN(start+len);'
can interfere with it.
Modified Paths:
--------------
trunk/exec.c
Modified: trunk/exec.c
===================================================================
--- trunk/exec.c 2008-10-28 10:21:03 UTC (rev 5562)
+++ trunk/exec.c 2008-10-28 10:24:11 UTC (rev 5563)
@@ -2081,12 +2081,13 @@
target_ulong end;
target_ulong addr;
+ if (start + len < start)
+ /* we've wrapped around */
+ return -1;
+
end = TARGET_PAGE_ALIGN(start+len); /* must do before we loose bits in the
next step */
start = start & TARGET_PAGE_MASK;
- if( end < start )
- /* we've wrapped around */
- return -1;
for(addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
p = page_find(addr >> TARGET_PAGE_BITS);
if( !p )
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