[xen staging] xen/arm: Check return code from fdt_finish_reservemap()

[patchbot@xxxxxxx]

commit dd0f6ea412a60b4a2efbebace21e2de02c6d3502
Author:     Michal Orzel <michal.orzel@xxxxxxx>
AuthorDate: Mon Mar 3 09:56:48 2025 +0100
Commit:     Michal Orzel <michal.orzel@xxxxxxx>
CommitDate: Tue Mar 4 08:54:53 2025 +0100

    xen/arm: Check return code from fdt_finish_reservemap()
    
    fdt_finish_reservemap() may fail (with -FDT_ERR_NOSPACE) in which case
    further DTB creation (in prepare_dtb_hwdom()) makes no sense. Fix it.
    
    Fixes: 13bb63b754e4 ("device tree,arm: supply a flat device tree to dom0")
    Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
---
 xen/arch/arm/domain_build.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index e760198d86..fea1382d49 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -2038,7 +2038,9 @@ static int __init prepare_dtb_hwdom(struct domain *d, 
struct kernel_info *kinfo)
     if ( ret < 0 )
         goto err;
 
-    fdt_finish_reservemap(kinfo->fdt);
+    ret = fdt_finish_reservemap(kinfo->fdt);
+    if ( ret )
+        goto err;
 
     ret = handle_node(d, kinfo, dt_host, default_p2mt);
     if ( ret )
--
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