[xen staging] tests/pdx: fix overflow from conversion from page index to address on 32bit

[patchbot@xxxxxxx]

commit 87774bbc3982a637081187583f1512c31e7e62d6
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Thu Mar 12 08:45:41 2026 +0100
Commit:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
CommitDate: Thu Mar 12 11:16:11 2026 +0100

    tests/pdx: fix overflow from conversion from page index to address on 32bit
    
    When building the PDX test harness as a 32bit executable the page shifts
    done on unsigned long types can overflow.  Instead use pfn_to_paddr(),
    which casts the values to paddr_t previous to doing the shift.
    
    Fixes: cb50e4033717 ("test/pdx: add PDX compression unit tests")
    Reported-by: Edwin Török <edwin.torok@xxxxxxxxxx>
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 tools/tests/pdx/test-pdx.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/tests/pdx/test-pdx.c b/tools/tests/pdx/test-pdx.c
index eefd54c768..066bd3e7e5 100644
--- a/tools/tests/pdx/test-pdx.c
+++ b/tools/tests/pdx/test-pdx.c
@@ -208,8 +208,8 @@ int main(int argc, char **argv)
             if ( !tests[i].ranges[j].start && !tests[i].ranges[j].end )
                 break;
 
-            pfn_pdx_add_region(tests[i].ranges[j].start << PAGE_SHIFT,
-                               size << PAGE_SHIFT);
+            pfn_pdx_add_region(pfn_to_paddr(tests[i].ranges[j].start),
+                               pfn_to_paddr(size));
         }
 
         if ( pfn_pdx_compression_setup(0) != tests[i].compress )
@@ -233,8 +233,8 @@ int main(int argc, char **argv)
             if ( !start && !end )
                 break;
 
-            if ( !pdx_is_region_compressible(start << PAGE_SHIFT, 1) ||
-                 !pdx_is_region_compressible((end - 1) << PAGE_SHIFT, 1) )
+            if ( !pdx_is_region_compressible(pfn_to_paddr(start), 1) ||
+                 !pdx_is_region_compressible(pfn_to_paddr(end - 1), 1) )
             {
                 printf(
     "PFN compression invalid, pages %#lx and %#lx should be compressible\n",
--
generated by git-patchbot for /home/xen/git/xen.git#staging