3 files changed, 21 insertions, 6 deletions

diff --git a/hw/uefi/Kconfig b/hw/uefi/Kconfig
index ca6c2bc46a..046d55320e 100644
--- a/hw/uefi/Kconfig
+++ b/hw/uefi/Kconfig
@@ -1,3 +1,3 @@
 config UEFI_VARS
 	bool
-        default y if X86_64 || AARCH64
+        default y if X86_64 || AARCH64 || RISCV64 || LOONGARCH64
diff --git a/hw/uefi/var-service-core.c b/hw/uefi/var-service-core.c
index 8ed8378ab9..4836a0cb81 100644
--- a/hw/uefi/var-service-core.c
+++ b/hw/uefi/var-service-core.c
@@ -29,6 +29,7 @@ static int uefi_vars_post_load(void *opaque, int version_id)
     uefi_vars_state *uv = opaque;
 
     uefi_vars_update_storage(uv);
+    uefi_vars_json_save(uv);
     uv->buffer = g_malloc(uv->buf_size);
     return 0;
 }
diff --git a/hw/uefi/var-service-json.c b/hw/uefi/var-service-json.c
index 761082c11f..ad3462cd15 100644
--- a/hw/uefi/var-service-json.c
+++ b/hw/uefi/var-service-json.c
@@ -178,7 +178,7 @@ void uefi_vars_json_init(uefi_vars_state *uv, Error **errp)
 
 void uefi_vars_json_save(uefi_vars_state *uv)
 {
-    GString *gstr;
+    g_autoptr(GString) gstr = NULL;
     int rc;
 
     if (uv->jsonfd == -1) {
@@ -187,18 +187,25 @@ void uefi_vars_json_save(uefi_vars_state *uv)
 
     gstr = uefi_vars_to_json(uv);
 
-    lseek(uv->jsonfd, 0, SEEK_SET);
+    rc = lseek(uv->jsonfd, 0, SEEK_SET);
+    if (rc < 0) {
+        warn_report("%s: lseek error", __func__);
+        return;
+    }
+
     rc = ftruncate(uv->jsonfd, 0);
     if (rc != 0) {
         warn_report("%s: ftruncate error", __func__);
+        return;
     }
+
     rc = write(uv->jsonfd, gstr->str, gstr->len);
     if (rc != gstr->len) {
         warn_report("%s: write error", __func__);
+        return;
     }
-    fsync(uv->jsonfd);
 
-    g_string_free(gstr, true);
+    fsync(uv->jsonfd);
 }
 
 void uefi_vars_json_load(uefi_vars_state *uv, Error **errp)
@@ -207,7 +214,7 @@ void uefi_vars_json_load(uefi_vars_state *uv, Error **errp)
     QObject *qobj;
     Visitor *v;
     char *str;
-    size_t len;
+    ssize_t len;
     int rc;
 
     if (uv->jsonfd == -1) {
@@ -215,7 +222,12 @@ void uefi_vars_json_load(uefi_vars_state *uv, Error **errp)
     }
 
     len = lseek(uv->jsonfd, 0, SEEK_END);
+    if (len < 0) {
+        warn_report("%s: lseek error", __func__);
+        return;
+    }
     if (len == 0) {
+        /* empty file */
         return;
     }
 
@@ -224,6 +236,8 @@ void uefi_vars_json_load(uefi_vars_state *uv, Error **errp)
     rc = read(uv->jsonfd, str, len);
     if (rc != len) {
         warn_report("%s: read error", __func__);
+        g_free(str);
+        return;
     }
     str[len] = 0;