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lib: don't create circular lists (fixes 6d83113)

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LISTNODE_DETACH doesn't clear out the node, and LISTNODE_ATTACH doesn't
set ->next (since it assumes a fresh/zeroed listnode).  As a result, the
new listnode_move_to_tail() created a nice circular list, in turn
crashing ospfd in ospf_write() later.

Reported-by: Martin Winter <mwinter@netdef.org>
Fixes: 6d83113 ("ospfd: Tweak previous iface RR write patch to avoid free/malloc & redundant log")
Cc: Paul Jakma <paul@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Acked-by: Greg Troxel <gdt@ir.bbn.com>
Acked-by: Dinesh Dutt <ddutt@cumulusnetworks.com>
Acked-by: Vincent JARDIN <vincent.jardin@6wind.com>
(cherry picked from commit 1c6db0d2da34044ddfb42665fda8a3387ecc451d)
This commit is contained in:
David Lamparter 2014-12-12 21:35:28 +01:00 committed by Daniel Walton
parent 37da8fa9a2
commit de111d75a9
1 changed files with 1 additions and 0 deletions
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lib/linklist.h
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@ -112,6 +112,7 @@ extern void list_add_list (struct list *, struct list *);
#define LISTNODE_ATTACH(L,N) \
do { \
(N)->prev = (L)->tail; \
(N)->next = NULL; \
if ((L)->head == NULL) \
(L)->head = (N); \
else \