[xen staging] EFI: Fix relocating ESRT for dom0

[patchbot@xxxxxxx]

commit 3ea44aa78c8170ca8010a89d24717d6f6ccfe564
Author:     Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Thu Feb 12 11:35:05 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Feb 12 11:35:05 2026 +0100

    EFI: Fix relocating ESRT for dom0
    
    Fix calculating the table size - it consists of a header + entries, not
    just entries.
    This bug caused the last entry to have garbage in its final fields,
    including LowestSupportedFwVersion and CapsuleFlags, which (usually)
    made fwupd able to detect firmware update availability, but refuse
    actually installing it.
    
    Fixes: dc7da0874ba4 ("EFI: preserve the System Resource Table for dom0")
    Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
    Acked-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
---
 xen/common/efi/boot.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 8adba7bd4d..967094994d 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -675,7 +675,8 @@ static size_t __init get_esrt_size(const 
EFI_MEMORY_DESCRIPTOR *desc)
     if ( esrt_ptr->FwResourceCount > available_len / 
sizeof(esrt_ptr->Entries[0]) )
         return 0;
 
-    return esrt_ptr->FwResourceCount * sizeof(esrt_ptr->Entries[0]);
+    return offsetof(EFI_SYSTEM_RESOURCE_TABLE,
+                    Entries[esrt_ptr->FwResourceCount]);
 }
 
 static EFI_GUID __initdata esrt_guid = EFI_SYSTEM_RESOURCE_TABLE_GUID;
--
generated by git-patchbot for /home/xen/git/xen.git#staging