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ebml: Validate 7-bit ASCII in gst_ebml_read_ascii

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This was triggering an UTF-8 assertion in gst_caps_set_simple for
corrupt files with garbage as codec id. Test case:
gstreamer_error_trying_to_set_invalid_utf8_as_codec_id.webm

Old gst_ebml_read_ascii renamed to gst_ebml_read_string, also used by
gst_ebml_read_utf8. Unlike for UTF-8, failure to validate is an error,
as gst_ebml_read_ascii is used for reading doctype and codec id and we
might just as well give up early in those cases.
This commit is contained in:
Philip Jägenstedt 2010-05-12 13:16:28 +02:00 committed by Sebastian Dröge
parent d146971128
commit c712d28796
1 changed files with 34 additions and 4 deletions
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38
gst/matroska/ebml-read.c
View file

@ -776,11 +776,11 @@ gst_ebml_read_float (GstEbmlRead * ebml, guint32 * id, gdouble * num)
}
/*
* Read the next element as an ASCII string.
* Read the next element as a C string.
*/
GstFlowReturn
gst_ebml_read_ascii (GstEbmlRead * ebml, guint32 * id, gchar ** str)
static GstFlowReturn
gst_ebml_read_string (GstEbmlRead * ebml, guint32 * id, gchar ** str)
{
guint8 *data;
guint size;
@ -797,6 +797,36 @@ gst_ebml_read_ascii (GstEbmlRead * ebml, guint32 * id, gchar ** str)
return ret;
}
/*
* Read the next element as an ASCII string.
*/
GstFlowReturn
gst_ebml_read_ascii (GstEbmlRead * ebml, guint32 * id, gchar ** str)
{
GstFlowReturn ret;
gchar *iter;
#ifndef GST_DISABLE_GST_DEBUG
guint64 oldoff = ebml->offset;
#endif
ret = gst_ebml_read_string (ebml, id, str);
if (ret != GST_FLOW_OK)
return ret;
for (iter = *str; *iter != '\0'; iter++) {
if (G_UNLIKELY (*iter & 0x80)) {
GST_ERROR_OBJECT (ebml,
"Invalid ASCII string at offset %" G_GUINT64_FORMAT, oldoff);
g_free (*str);
return GST_FLOW_ERROR;
}
}
return ret;
}
/*
* Read the next element as a UTF-8 string.
*/
@ -810,7 +840,7 @@ gst_ebml_read_utf8 (GstEbmlRead * ebml, guint32 * id, gchar ** str)
guint64 oldoff = ebml->offset;
#endif
ret = gst_ebml_read_ascii (ebml, id, str);
ret = gst_ebml_read_string (ebml, id, str);
if (ret != GST_FLOW_OK)
return ret;