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scripts/gdb: fix list_for_each

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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>
This commit is contained in:
George Prekas
2021-02-25 17:22:34 -08:00
committed by Linus Torvalds
parent 3d2fc4c082
commit db7fbf492d
1 changed files with 5 additions and 0 deletions
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5
scripts/gdb/linux/lists.py
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@@ -27,6 +27,11 @@ def list_for_each(head):
raise TypeError("Must be struct list_head not {}" raise TypeError("Must be struct list_head not {}"
.format(head.type)) .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() node = head['next'].dereference()
while node.address != head.address: while node.address != head.address:
yield node.address yield node.address