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Fix assertion failure if IMG/@usemap refers to a different file.

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Change test/imgmap2.html so it can be used for testing this too.

Debian Iceweasel 3.0.4 does not appear to support such external
client-side image maps.  Well, that's one place where ELinks is
superior, I guess.  There might be a security problem though if ELinks
were to let scripts of the referring page examine the links in the
image map.
This commit is contained in:
Kalle Olavi Niemitalo 2009-01-01 18:38:07 +00:00 committed by Kalle Olavi Niemitalo
parent dc41f0bd4c
commit 29c34df62e
3 changed files with 24 additions and 12 deletions
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2
NEWS
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@ -11,6 +11,8 @@ ELinks 0.12pre2.GIT now:
To be released as 0.12pre3, 0.12rc1, or even 0.12.0. This branch also
includes the changes listed under ``ELinks 0.11.5.GIT'' below.
* critical: Fix assertion failure if IMG/@usemap refers to a different
file.
* Preserve newlines in hidden input fields, and submit them as CRLF.
Previously, they could turn into spaces or disappear entirely.
* Perl scripts can use modules that dynamically load C libraries, like

23
src/session/session.c
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@ -518,17 +518,23 @@ maybe_pre_format_html(struct cache_entry *cached, struct session *ses)
* were 0, it could then be freed, and the
* cached->preformatted assignment at the end of this function
* would crash. Normally, the document has a reference to the
* cache entry, and that suffices. If the following assertion
* ever fails, object_lock(cached) and object_unlock(cached)
* must be added to this function. */
assert(cached->object.refcount > 0);
if_assert_failed return;
* cache entry, and that suffices. However, if the cache
* entry was loaded to satisfy e.g. USEMAP="imgmap.html#map",
* then cached->object.refcount == 0 here, and must be
* incremented.
*
* cached->object.refcount == 0 is safe while the cache entry
* is being loaded, because garbage_collection() calls
* is_entry_used(), which checks whether any connection is
* using the cache entry. But loading has ended before this
* point. */
object_lock(cached);
fragment = get_cache_fragment(cached);
if (!fragment) return;
if (!fragment) goto unlock_and_return;
/* We cannot do anything if the data are fragmented. */
if (!list_is_singleton(cached->frag)) return;
if (!list_is_singleton(cached->frag)) goto unlock_and_return;
set_event_id(pre_format_html_event, "pre-format-html");
trigger_event(pre_format_html_event, ses, cached);
@ -536,6 +542,9 @@ maybe_pre_format_html(struct cache_entry *cached, struct session *ses)
/* XXX: Keep this after the trigger_event, because hooks might call
* normalize_cache_entry()! */
cached->preformatted = 1;
unlock_and_return:
object_unlock(cached);
}
#endif

11
test/imgmap2.html
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@ -1,5 +1,6 @@
<TITLE>Double-free crash in USEMAP</TITLE>
<P><IMG src="/dev/null" usemap="#crasher"></P>
<MAP name="crasher">
<AREA shape="rect" coords="42,42,69,69" href="http://elinks.cz/" alt="see this?">
<!-- no newline at the end of this line --></MAP>
<TITLE>Crashes in client-side image maps</TITLE>
<P><IMG src="image.png" usemap="imgmap.html#map" alt="ImageMap"> in another file</P>
<P><IMG src="image.png" usemap="#at_eof" alt="ImageMap"> at the very end of this file</P>
<MAP name="at_eof">
<AREA shape="rect" coords="12,1, 30,18" href="http://elinks.cz/" alt="see this?">
<!-- no newline at the end of this line --></MAP>