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Subject: Prevent segfault for formUpdateBuffer
Author: Tatsuya Kinoshita <tats@debian.org>
Bug-Debian: https://github.com/tats/w3m/issues/22 [CVE-2016-9440]
Origin: https://anonscm.debian.org/cgit/collab-maint/w3m.git/commit/?id=4a8d16fc8d08206dd7142435054ee38ff41805b7
diff --git a/form.c b/form.c
index 779ba2f..20b7310 100644
--- a/form.c
+++ b/form.c
@@ -461,6 +461,8 @@ formUpdateBuffer(Anchor *a, Buffer *buf, FormItemList *form)
#endif /* MENU_SELECT */
p = form->value->ptr;
l = buf->currentLine;
+ if (!l)
+ break;
if (form->type == FORM_TEXTAREA) {
int n = a->y - buf->currentLine->linenumber;
if (n > 0)
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