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From 701b16e0ee6f159cbf8498f4569022005dfdebbd Mon Sep 17 00:00:00 2001
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From: Kamil Dudka <kdudka@redhat.com>
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Date: Wed, 19 Mar 2014 11:48:34 +0100
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Subject: [PATCH] lists.h: list_is_singleton() now returns false for empty list
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We have a crash report of ELinks 0.12pre6 with backtrace going through
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bookmark_all_terminals(). I believe it is caused by list_is_singleton()
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returning true for an empty list. Consequently, bookmark_terminal()
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attempts to access a list item that does not exist.
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While it would be possible to fix bookmark_all_terminals() to explicitly
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check the list for emptiness, I propose to fix list_is_singleton() such
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that it does not return true for an empty list. I checked the other
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uses of list_is_singleton() and the proposed change should not introduce
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any change in the behavior elsewhere.
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Bug: https://bugzilla.redhat.com/1075415
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---
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src/util/lists.h | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/util/lists.h b/src/util/lists.h
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index b577c9f..9da38ae 100644
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--- a/src/util/lists.h
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+++ b/src/util/lists.h
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@@ -146,7 +146,8 @@ do { \
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#define list_empty(x) (list_magic_chkbool(x, "list_empty") && (x).next == &(x))
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#define list_is_singleton(x) \
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- (list_magic_chkbool(x, "list_is_singleton") && (x).next == (x).prev)
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+ (list_magic_chkbool(x, "list_is_singleton") && (x).next == (x).prev \
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+ && !list_empty(x))
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#define list_has_prev(l,p) \
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(list_magic_chkbool(l, "list_has_prev") && (p)->prev != (void *) &(l))
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--
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1.8.3.1
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