[PATCH] scripts/gdb: fix list_for_each

[George Prekas]

If the next pointer is NULL, list_for_each gets stuck in an infinite
loop.

Signed-off-by: George Prekas <prekageo@xxxxxxxxxx>
---
 scripts/gdb/linux/lists.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/gdb/linux/lists.py b/scripts/gdb/linux/lists.py
index c487ddf09d38..424a91c1aa8b 100644
--- a/scripts/gdb/linux/lists.py
+++ b/scripts/gdb/linux/lists.py
@@ -27,6 +27,8 @@ def list_for_each(head):
         raise TypeError("Must be struct list_head not {}"
                            .format(head.type))

+    if head['next'] == 0:
+        return
     node = head['next'].dereference()
     while node.address != head.address:
         yield node.address
--
2.24.3.AMZN