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Subject: Prevent null pointer deref due to bad form id
Author: Tatsuya Kinoshita <tats@debian.org>
Bug-Debian: https://github.com/tats/w3m/issues/39 [CVE-2016-9628]
Origin: https://anonscm.debian.org/cgit/collab-maint/w3m.git/commit/?id=9db438094e5f0d84842bcbd248f282594ccb3c89
diff --git a/file.c b/file.c
index e3f0544..834071d 100644
--- a/file.c
+++ b/file.c
@@ -5805,7 +5805,8 @@ HTMLlineproc2body(Buffer *buf, Str (*feed) (), int llimit)
parsedtag_get_value(tag, ATTR_FID, &form_id);
parsedtag_get_value(tag, ATTR_TOP_MARGIN, &top);
parsedtag_get_value(tag, ATTR_BOTTOM_MARGIN, &bottom);
- if (form_id < 0 || form_id > form_max || forms == NULL)
+ if (form_id < 0 || form_id > form_max ||
+ forms == NULL || forms[form_id] == NULL)
break; /* outside of <form>..</form> */
form = forms[form_id];
if (hseq > 0) {
@@ -7011,6 +7012,8 @@ print_internal_information(struct html_feed_environ *henv)
if (form_max >= 0) {
FormList *fp;
for (i = 0; i <= form_max; i++) {
+ if (forms[i] == NULL)
+ continue;
fp = forms[i];
s = Sprintf("<form_int fid=\"%d\" action=\"%s\" method=\"%s\"",
i, html_quote(fp->action->ptr),
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