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Subject: Prevent deref null pointer in shiftAnchorPosition()
Author: Tatsuya Kinoshita <tats@debian.org>
Bug-Debian: https://github.com/tats/w3m/issues/40 [CVE-2016-9629]
Origin: https://anonscm.debian.org/cgit/collab-maint/w3m.git/commit/?id=a088e0263c48ba406a7ae0932a1ae64a25be7acd
diff --git a/anchor.c b/anchor.c
index e006aea..ecb211d 100644
--- a/anchor.c
+++ b/anchor.c
@@ -551,7 +551,7 @@ shiftAnchorPosition(AnchorList *al, HmarkerList *hl, int line, int pos,
break;
if (a->start.pos > pos) {
a->start.pos += shift;
- if (hl->marks[a->hseq].line == line)
+ if (hl && hl->marks && hl->marks[a->hseq].line == line)
hl->marks[a->hseq].pos = a->start.pos;
}
if (a->end.pos >= pos)
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