From bde3a3e9a0b10a9274a837ea09296400cdd513c9 Mon Sep 17 00:00:00 2001 From: Tatsuya Kinoshita Date: Wed, 17 Aug 2016 19:47:19 +0900 Subject: Prevent negative array index for selectnumber and textareanumber Bug-Debian: https://github.com/tats/w3m/issues/12 [CVE-2016-9424] Origin: https://anonscm.debian.org/cgit/collab-maint/w3m.git/commit/?id=a25fd09f74fb83499396935a96d63bb7cb8e2c58 --- form.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'form.c') diff --git a/form.c b/form.c index 87a5d49..da115fa 100644 --- a/form.c +++ b/form.c @@ -10,8 +10,10 @@ #include "regex.h" extern Str *textarea_str; +extern int max_textarea; #ifdef MENU_SELECT extern FormSelectOption *select_option; +extern int max_select; #include "menu.h" #endif /* MENU_SELECT */ @@ -122,10 +124,12 @@ formList_addInput(struct form_list *fl, struct parsed_tag *tag) parsedtag_get_value(tag, ATTR_SIZE, &item->size); parsedtag_get_value(tag, ATTR_MAXLENGTH, &item->maxlength); item->readonly = parsedtag_exists(tag, ATTR_READONLY); - if (parsedtag_get_value(tag, ATTR_TEXTAREANUMBER, &i)) + if (parsedtag_get_value(tag, ATTR_TEXTAREANUMBER, &i) + && i >= 0 && i < max_textarea) item->value = item->init_value = textarea_str[i]; #ifdef MENU_SELECT - if (parsedtag_get_value(tag, ATTR_SELECTNUMBER, &i)) + if (parsedtag_get_value(tag, ATTR_SELECTNUMBER, &i) + && i >= 0 && i < max_select) item->select_option = select_option[i].first; #endif /* MENU_SELECT */ if (parsedtag_get_value(tag, ATTR_ROWS, &p)) -- cgit v1.2.3