linux-kernel - [PATCH] scripts/gdb: fix list_for

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Message-ID: <3b382958-9f1d-a3d2-a239-09ba084227e6@amazon.com>
Date:   Tue, 22 Sep 2020 09:28:21 -0500
From:   George Prekas <prekageo@...zon.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Jan Kiszka <jan.kiszka@...mens.com>,
        Kieran Bingham <kbingham@...nel.org>
Subject: [PATCH] scripts/gdb: fix list_for_each

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

Signed-off-by: George Prekas <prekageo@...zon.com>
---
  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