[xen staging] libxenguest: fix off-by-1 in colo-secondary-bitmap merging

[patchbot@xxxxxxx]

commit e241d15f1c8a8a02baa401af857393f9ada5aeb3
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Aug 13 16:49:46 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Aug 13 16:49:46 2021 +0200

    libxenguest: fix off-by-1 in colo-secondary-bitmap merging
    
    Valid GFNs (having a representation in the dirty bitmap) need to be
    strictly below p2m_size.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/libs/guest/xg_sr_save.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/libs/guest/xg_sr_save.c b/tools/libs/guest/xg_sr_save.c
index 3fce41b6cf..0266e0a94a 100644
--- a/tools/libs/guest/xg_sr_save.c
+++ b/tools/libs/guest/xg_sr_save.c
@@ -614,7 +614,7 @@ static int colo_merge_secondary_dirty_bitmap(struct 
xc_sr_context *ctx)
     for ( i = 0; i < count; i++ )
     {
         pfn = pfns[i];
-        if ( pfn > ctx->save.p2m_size )
+        if ( pfn >= ctx->save.p2m_size )
         {
             PERROR("Invalid pfn 0x%" PRIx64, pfn);
             rc = -1;
--
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