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samiparse: fix handling of self-closing tags

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We would check the wrong string (rest of line rather than element)
for the / suffix of self-closing tags, which is not only wrong but
also has atrocious performance with certain strings like the garbled
nonsense clusterfuzz feeds us, which might cause discoverer to time
out when processing garbled SAMI files.

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=47461

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2685>
This commit is contained in:
Tim-Philipp Müller 2022-06-30 00:13:19 +01:00 committed by GStreamer Marge Bot
parent 79d8b435d7
commit 84a3b0ef87
2 changed files with 25 additions and 1 deletions
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2
subprojects/gst-plugins-base/gst/subparse/samiparse.c
View file

@ -543,7 +543,7 @@ html_context_parse (HtmlContext * ctxt, gchar * text, gsize text_len)
next = string_token (next, ">", &element);
next++;
if (g_str_has_suffix (next, "/")) {
if (g_str_has_suffix (element, "/")) {
/* handle <blah/> */
element[strlen (element) - 1] = '\0';
html_context_handle_element (ctxt, element + 1, TRUE);

24
subprojects/gst-plugins-base/tests/check/elements/subparse.c
View file

@ -1026,6 +1026,29 @@ GST_START_TEST (test_sami_comment)
GST_END_TEST;
GST_START_TEST (test_sami_self_contained_tags)
{
SubParseInputChunk sami_input[] = {
{"<SAMI>\n"
"<BODY>\n"
" <SYNC Start=1000>\n"
" <P Class=CC>\n"
" This line has a self-closing format tag<i /> and more.\n",
1000 * GST_MSECOND, 2000 * GST_MSECOND,
"This line has a self-closing format tag<i></i>and more."},
{" <SYNC Start=2000>\n"
" <P Class=CC>\n"
" This is a third comment.<br>\n"
" This is a fourth comment.\n" "</BODY>\n" "</SAMI>\n",
2000 * GST_MSECOND, GST_CLOCK_TIME_NONE,
"This is a third comment.\nThis is a fourth comment."}
};
do_test (sami_input, G_N_ELEMENTS (sami_input), "pango-markup");
}
GST_END_TEST;
GST_START_TEST (test_lrc)
{
SubParseInputChunk lrc_input[] = {
@ -1106,6 +1129,7 @@ subparse_suite (void)
tcase_add_test (tc_chain, test_sami_html_entities);
tcase_add_test (tc_chain, test_sami_bad_entities);
tcase_add_test (tc_chain, test_sami_comment);
tcase_add_test (tc_chain, test_sami_self_contained_tags);
tcase_add_test (tc_chain, test_lrc);
tcase_add_test (tc_chain, test_raw_conversion);
return s;