xen-netfront: Fix NULL sring after live migration

[mirror_ubuntu-jammy-kernel.git] / lib / list_debug.c

diff --git a/lib/list_debug.c b/lib/list_debug.c
index 5d5424b51b746fe64a38bde879d985e6e6780284..413daa72a3d83d54c960843b667711cc26f7487b 100644 (file)
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -20,7 +20,11 @@
 bool __list_add_valid(struct list_head *new, struct list_head *prev,
                      struct list_head *next)
 {
-       if (CHECK_DATA_CORRUPTION(next->prev != prev,
+       if (CHECK_DATA_CORRUPTION(prev == NULL,
+                       "list_add corruption. prev is NULL.\n") ||
+           CHECK_DATA_CORRUPTION(next == NULL,
+                       "list_add corruption. next is NULL.\n") ||
+           CHECK_DATA_CORRUPTION(next->prev != prev,
                        "list_add corruption. next->prev should be prev (%px), but was %px. (next=%px).\n",
                        prev, next->prev, next) ||
            CHECK_DATA_CORRUPTION(prev->next != next,
@@ -42,7 +46,11 @@ bool __list_del_entry_valid(struct list_head *entry)
        prev = entry->prev;
        next = entry->next;
 
-       if (CHECK_DATA_CORRUPTION(next == LIST_POISON1,
+       if (CHECK_DATA_CORRUPTION(next == NULL,
+                       "list_del corruption, %px->next is NULL\n", entry) ||
+           CHECK_DATA_CORRUPTION(prev == NULL,
+                       "list_del corruption, %px->prev is NULL\n", entry) ||
+           CHECK_DATA_CORRUPTION(next == LIST_POISON1,
                        "list_del corruption, %px->next is LIST_POISON1 (%px)\n",
                        entry, LIST_POISON1) ||
            CHECK_DATA_CORRUPTION(prev == LIST_POISON2,