[Qemu-devel] [PATCH] page_check_range: fix wrap around test

[Lauro Ramos Venancio <lauro.venancio@openbossa.org>]

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Move up the warp around test because line 
'end = TARGET_PAGE_ALIGN(start+len);'
can interfere on it causing Segmentation Fault.

-- 
Lauro Ramos Venancio
INdT - Instituto Nokia de Tecnologia

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Index: exec.c
===================================================================
--- exec.c	(revision 5391)
+++ exec.c	(working copy)
@@ -2068,12 +2068,13 @@
     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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