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Subject: Prevent segfault with incorrect form_int fid
Author: Tatsuya Kinoshita <tats@debian.org>
Bug-Debian: https://github.com/tats/w3m/issues/15 [CVE-2016-9434]
Origin: https://anonscm.debian.org/cgit/collab-maint/w3m.git/commit/?id=3d4eeda9ec0cb91e23bab7dc260d4c515119eb4b
diff --git a/file.c b/file.c
index 4056393..b30aa6b 100644
--- a/file.c
+++ b/file.c
@@ -4172,7 +4172,7 @@ process_form_int(struct parsed_tag *tag, int fid)
forms = New_N(FormList *, forms_size);
form_stack = NewAtom_N(int, forms_size);
}
- else if (forms_size <= form_max) {
+ if (forms_size <= form_max) {
forms_size += form_max;
forms = New_Reuse(FormList *, forms, forms_size);
form_stack = New_Reuse(int, form_stack, forms_size);
@@ -6086,7 +6086,8 @@ HTMLlineproc2body(Buffer *buf, Str (*feed) (), int llimit)
fclose(debug);
#endif
for (form_id = 1; form_id <= form_max; form_id++)
- forms[form_id]->next = forms[form_id - 1];
+ if (forms[form_id])
+ forms[form_id]->next = forms[form_id - 1];
buf->formlist = (form_max >= 0) ? forms[form_max] : NULL;
if (n_textarea)
addMultirowsForm(buf, buf->formitem);
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