[PATCH v2] scripts/gdb: fix list_for_each

[George Prekas]

If the list is uninitialized (next pointer is NULL), list_for_each gets
stuck in an infinite loop. Print a message and treat list as empty.

Signed-off-by: George Prekas <prekageo@xxxxxxxxxx>
---
 scripts/gdb/linux/lists.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/gdb/linux/lists.py b/scripts/gdb/linux/lists.py
index c487ddf09d38..bae4d70b7eae 100644
--- a/scripts/gdb/linux/lists.py
+++ b/scripts/gdb/linux/lists.py
@@ -27,6 +27,11 @@ def list_for_each(head):
         raise TypeError("Must be struct list_head not {}"
                            .format(head.type))

+    if head['next'] == 0:
+        gdb.write("list_for_each: Uninitialized list '{}' treated as 
empty\n"
+                     .format(head.address))
+        return
+
     node = head['next'].dereference()
     while node.address != head.address:
         yield node.address
--
2.16.6