Commit db7fbf49 authored by George Prekas's avatar George Prekas Committed by Linus Torvalds
Browse files

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: default avatarGeorge Prekas <prekageo@amazon.com>
Reviewed-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3d2fc4c0

scripts/gdb/linux/lists.py

+5 −0
Original line number Diff line number Diff line
@@ -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