diff options
| author | George Prekas <prekageo@amazon.com> | 2021-02-25 17:22:34 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-26 09:41:05 -0800 |
| commit | db7fbf492d94a0b59d8f85b3184231662586dea9 (patch) | |
| tree | adfd16adb5fc0ad46a05fb60f8753ff80ae0232c /scripts | |
| parent | 3d2fc4c082448e9c05792f9b2a11c1d5db408b85 (diff) | |
| download | lwn-db7fbf492d94a0b59d8f85b3184231662586dea9.tar.gz lwn-db7fbf492d94a0b59d8f85b3184231662586dea9.zip | |
scripts/gdb: fix list_for_each
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.
Link: https://lkml.kernel.org/r/4ae23bb1-c333-f669-da2d-fa35c4f49018@amazon.com
Signed-off-by: George Prekas <prekageo@amazon.com>
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/gdb/linux/lists.py | 5 |
1 files changed, 5 insertions, 0 deletions
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 |